几道数学题求解急急急！
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这些题目有点简单啊。挑几道难的出来吧
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求解一道数学题。几加几等于8？
规矩你们懂的
AB=AC ，PH垂直于AB ，P...
已知本人还有100大洋，...
萌猫镇楼。
二话不说直接上
楼主太内涵了
1+7.正解.求粉.有粉必回
楼主== 2+1 +3
好玩的游戏不会腻，
七楼已发 请注意查收
楼主，快啊，都粉你了，我懂得
楼主是骗子
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好心发种居然说我是骗纸！！！ 你自己看邮箱有木有！！！！
现在收到了嘛，讨厌
留过邮箱的楼主都发了~
大家都是呢
17门 lz你懂的
是1+7。。。
楼上的全部发了。。。话说没粉没有动力呢
卧（河蟹）槽。17......
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【急】――几道数学题求解！用方程解答！ 航空母舰以每小时20千米的速度从西向东航行，它应在起飞后几小时内开始返回航空母舰上，飞机以每小时800千米的速度从航空母舰上起飞向西航行执行任务，返回时需要12消失？（精确到0，求两码头之间的航程1，已知水流速度是3千米&#47.01小时）非常感谢！2，需要8消失，如果飞机在空间最多能连续飞行3消失;时：一艘论坛从甲码头顺流而下到达乙码头 Kam?Depart 【急】――几道数学题求解！用方程解答！
航空母舰以每小时20千米的速度从西向东航行，飞机以每小时800千米的速度从航空母舰上起飞向西航行执行任务？（精确到0，如果飞机在空间最多能连续飞行3消失，返回时需要12消失.01小时）800&#47，求两码头之间的航程1，已知水流速度是3千米/(800-20)*3=3！144S=(8T+24)S=(12T-36)2，需要8消失，它应在起飞后几小时内开始返回航空母舰上;时：一艘论坛从甲码头顺流而下到达乙码头
1.(X+3)*8=(X-3)*12
2.x为飞机向西飞行的时间 Y是飞机向东到停到船上的时间
(800+20)X=(800-20)*Y
设船的速度为x，则
(x+3)*8=(x-3)*12解得 x=15
所以码头距离为 （15+3）*8=144千米2.
设飞机起飞后x小时返回航母，那么（3-x）就是飞机返航那一点到它到底航母上的时间。那么 800*x+20*x+20*(3-x)=800*(3-x)解得x=0=1.54小时
设船的速度为x，
(x+3)*8=(x-3)*12解得 x=15
所以码头距离为 （15+3）*8=144千米那么 800*x+20*x+20*(3-x)=800*(3-x)解得x=0=1.54小时
1. 设两码头之间的航程s
，船的速度v
顺流而下：8（v+3）=s
逆流而上： 12（v-3）=s
联立方程得： v=15
s=144千米2.设它应在起飞后x小时内开始返回航空母舰上 800（3-x）=（800+20）x+20（3-x)
1.解:设船速为X千米/小时.8(X+3)=12(X-3)
8X+24=12X-36
24+36=12X-8X
X=15则航程为8(X+3)=8*(15+3)=144千米2.解:设飞机起飞后X小时内开始返回航空母舰上,800X+800X+2*30=3*800后使用快捷导航没有帐号？
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[求助]几道不知道思路的数学题(尚未解决！）
Q11:On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains.& If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday?0.0080.1280.4880.5120.640已经解决Q22:A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office.& In how many ways can the company assign 3 employees to 2 different offices?56789已经解决Q15:Which of the following fractions has a decimal equivalent that is a terminating decimal?10/18915/19616/22525/14439/128已经解决Q10:A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.& Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.& What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?2036486084已经解决已经解决已经解决Q33:A photographer&&&will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.& The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.& How many such arrangements of the 6 people are possible?555692436====================================================================================新问题The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.& The least possible value of the actual area of the square region is36.00 sq cm35.00 sq cm33.75 sq cm30.25 sq cm25.00 sq cmQ2:A certain characteristic in a large population has a distribution that is symmetric about the mean m.& If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m +&&&&d ?16%32%48%84%92%Q1:If the probability is 0.54 that Stock A will increase in value during the next month and the probability is 0.68 that Stock B will increase in value during the next month, what is the greatest possible value for the probability that neither of these two events will occur?0.220.320.370.460.63Q26How many different 6-letter sequences are there that consist of 1 A, 2 B’s, and 3 C’s ?660120360720Q29:June 25, 1982, fell on a Friday.& On which day of the week did June 25, 1987, fall?& (Note: 1984 was a leap year.)SundayMondayTuesdayWednesdayThursday[此贴子已经被作者于 22:41:03编辑过]
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11.0.8*0.8*0.2=0.12812.2*2*2=815.题目看不懂，不好意思
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15题：下面那个数是有限小数选128那个
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谢谢楼上2位！11题的来由：是不是说按照人来算，每个人都有2个选择，去A部门或者去B部门，所以3个人就是2X2X2了？15题是根据什么来判断的？还请明示！谢谢
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15.128是2的几次幂，所以一定是有限小数10.再次题目看不懂23.应该还要乘以2，因为两面皆可么33.最高最矮的人位置是固定的，其余四个人排列，设为A,B,C,D,身高升序，共有5种排法C,D&&&& B,D&&&& B,C&&&& A,D&&& A,C& A,B&&&& A,C&&&& A,D&&&& B,C&&& B,D
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Q11:On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains.& If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday?A.&&& 0.008B.&&&& 0.128C.&&&& 0.488D.&&& 0.512E.&&&& 0.640已经解决0.8*0.8*0.2=0.128Q22:A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office.& In how many ways can the company assign 3 employees to 2 different offices?A.&&& 5B.&&&& 6C.&&&& 7D.&&& 8E.&&&& 9已经解决2个office人数分别为a和b,有以下情况:a=0& b=3&& 这里可能性只有1a=1& b=2&& 这里可能性有3(a中可以是3人中任一个)a=2& b=1&& 这里可能性有3(b中可以是3人中任一个)a=3& b=0&& 这里可能性只有1共1+3+3+1=9种Q15:Which of the following fractions has a decimal equivalent that is a terminating decimal?A.&&& 10/189B.&&&& 15/196C.&&&& 16/225D.&&& 25/144E.&&&& 39/128E的分母=2*2*2*2*2*2*2所以该分数等于有尽小数Q10:A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.& Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.& What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?&&&&A.&&& 20B.&&&& 36C.&&&& 48D.&&& 60E.&&&& 84&2个scale之间的对应是线形关系,可列等式Y=aX+b& 其中X是R-scale上的任意数,Y是S-scale上的对应数,a,b是常数.根据条件列等式:30=6a+b60=24a+b计算得出a=5/3,b=20当Y=100时,X=48,得解.&2个scale之间的对应是线形关系,可列等式Y=aX+b& 其中X是R-scale上的任意数,Y是S-scale上的对应数,a,b是常数.根据条件列等式:30=6a+b60=24a+b计算得出a=5/3,b=20当Y=100时,X=48,得解.Q23:When tossed, a certain coin has equal probability of landing on either side.& If the coin is tossed 3 times, what is the probability that it will land on the same side each time?&&&&A.&&& 1/8B.&&&& 1/4C.&&&& 1/3D.&&& 3/8E.&&&& 1/2按我原来以为，应该是三个1/2的连乘，但是答案说是B? &1/2*1/2*1/2*2=1/4&& 有正反面2种可能,所以还要*2&1/2*1/2*1/2*2=1/4&& 有正反面2种可能,所以还要*2Q33:A photographer&&&will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.& The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.& How many such arrangements of the 6 people are possible?&&&&A.&&& 5B.&&&& 6C.&&&& 9D.&&& 24E.&&&& 36这个排列比较复杂，不知道如何理清，请指点。&&这个数量比较少我还是用列举法.按身高把人列为1-6,6最高.根据条件判断1在第一排左一,6在第二排左三.(因为反之不可能)第一排左二必须有三个数大于它.(第一排左三,第二排左二和第二排左三6),所以只有2,3两种可能.当第一排左二为2时,第一排左三有3,4,5三种可能;当第一排左二为3时,第一排左三有4,5两种可能.共五种.&这个数量比较少我还是用列举法.按身高把人列为1-6,6最高.根据条件判断1在第一排左一,6在第二排左三.(因为反之不可能)第一排左二必须有三个数大于它.(第一排左三,第二排左二和第二排左三6),所以只有2,3两种可能.当第一排左二为2时,第一排左三有3,4,5三种可能;当第一排左二为3时,第一排左三有4,5两种可能.共五种.[此贴子已经被作者于 11:17:57编辑过]
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第10题终于看懂了
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以下是引用channelyoung在 11:09:00的发言：Q22:A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office.& In how many ways can the company assign 3 employees to 2 different offices?A.&&& 5B.&&&& 6C.&&&& 7D.&&& 8E.&&&& 9已经解决2个office人数分别为a和b,有以下情况:a=0& b=3&& 这里可能性只有1a=1& b=2&& 这里可能性有3(a中可以是3人中任一个)a=2& b=1&& 这里可能性有3(b中可以是3人中任一个)a=3& b=0&& 这里可能性只有1共1+3+3+1=9种谢谢楼上！不过这个算术似乎不对吧？呵呵1+3+3+1=8，不是9.莫非你的键盘和我一样，我是8和7这2个数字键居然是装反了的，所以错无数次才发现原来是装错了。
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是8，打错了。。。见笑啦
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顶顶，请知道的帮忙看看还有几道没解决！
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