49x99又49分之48630除以42的简便算法法

来源：蜘蛛抓取(WebSpider) 时间：2014-10-07 09:21 标签： 78x99十78的简便运算
简算49×99-51要脱式计算.
太子【神】rD8
49×99－51＝49×（100－1）－51＝＝4900－（49＋51）＝＝4800
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49X99-51 =3X3X7X7X11-3X17 =3【3X7X7X11-17】 =3【77X7X3-17】 =3【539X3-17】 =3【1617-17】=3X1600=4800；
49*（100-1)-51==4800 看了过程，熟悉后心算都可以的
扫描下载二维码49x99又49分之48简便算法
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扫描下载二维码49+49x99用乘法分配律怎么算_百度知道
49+49x99用乘法分配律怎么算
49+49x99=49×（1+99）=49x100=4900
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出门在外也不愁- 50又50分之49乘以50 简便运算.突然忘了好心人高速我把.明天就要交了还有。100又99分之98乘以99、49又50分之49乘以50 99又99分之98乘以99
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50又50分之49乘以50 =(50+49/50)*50=2500+49=2549
50 50/49×50=（50+50+1/49）×50= 50×50+50×50+50×1/49= /49= = 5050/49
(50＋49/50)X50=50X50+(49/50)X50=2500+49=2549
扫描下载二维码用简便方法计算（1）49.9²+9.98+0.1²（2）99²+199
ck第五弹籉鴶
（1）49.9²+9.98+0.1²=49.9²+2×4.99+0.1²=（49.9+0.1）²=50²=2500（2）99²+199=99²+2×99+1=（99+1）²=100²=10000
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