请问在吗一下-7/9-9 7/14--9x 1414y≤714

解方程,共六题。 第一题x+0.7=14 x/9=90 0.9x=2.43 x-54=18 76+解方程,共六题。第一题x+0.7=14x/9=900.9x=2.43x-54=1876+x=912.1x=0.84谢谢,求小学学霸!
13.3,810,2.7,72,15,0.42
13.93102772150.4
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扫描下载二维码1.x²-x+1\42.(x+y)²+32z²-12(x+y)z3.1\4a^n+1-9a^n-14.(-1\3)x^4y-9xy5.-6x^n-1 -x^n -9x^n-26.4x²+1\4-2x-9y²7.4a²b²-(a²+b²-1)²8.a^6n-(1/64)b^6n有没有老师可以指导一下?我还是弄不懂怎样因式分解
初二的话,应该有提取公因式、公式法、配平法,不知道你们老师有没有提到过换元法和十字相乘法,那两种方法害死比较实用的.平方差公式:a2-b2=(a+b)(a-b)完全平方公式:a2+2ab+b2=(a+b)2
a2-2ab+b2=(a-b)2; 十字相乘法:十字相乘法
这种方法有两种情况.
①x2+(p+q)x+pq型的式子的因式分解
这类二次三项式的特点是:二次项的系数是1;常数项是两个数的积;一次项系数是常数项的两个因数的和.因此,可以直接将某些二次项的系数是1的二次三项式因式分x^2+(p+q)x+pq=(x+p)(x+q) .
②kx2+mx+n型的式子的因式分解
如果有k=ac,n=bd,且有ad+bc=m时,那么kx2+mx+n=(ax+b)(cx+d).
图示如下:
-3×7=-21,1×2=2,且2-21=-19,
所以7x2-19x-6=(7x+2)(x-3).
对于某些不能利用公式法的多项式,可以将其配成一个完全平方式,然后再利用平方差公式,就能将其因式分解,这种方法叫配方法.属于拆项、补项法的一种特殊情况.也要注意必须在与原多项式相等的原则下进行变形.
例如:x2+3x-40
=x2+3x+2.25-42.25
=(x+1.5)2-(6.5)2
=(x+8)(x-5).这个是我剪切下来的比较有用的部分.如果你还有什么不懂得话,可以去看百度的/view/19859.htm?fr=ala0_1_1
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相关新闻推荐1.x²-x+1\42.(x+y)²+32z²-12(x+y)z3.1\4a^n+1-9a^n-14.(-1\3)x^4y-9xy5.-6x^n-1 -x^n -9x^n-26.4x²+1\4-2x-9y²7.4a²b²-(a²+b²-1)²8.a^6n-(1/64)b^6n有没有老师可以指导一下?我还是弄不懂怎样因式分解
rbRI14FP06
1、(x-1/2)^22、(x+y-4z)(x+y-8z)3、a^n-1(1/2a+3)(1/2a-3)4、暂时没想到5、-(x^n-2)(x+3)^26、(2x-1/2+3y)(2x-1/2-3y)7、-[-1+(a+b)^2][-1+(a-b)^2]8、(a+1/8b^3n)(a-1/8b^3n)有具体方法上的问题实在不知道就hi我吧
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扫描下载二维码这道题哪算错了?8/9-7/9x=1/67/9x=1/6+8/97/9x=19/18x=19/18÷7/9x=19/14验算结果:8/9-7/9×19/14=8/9-18/19这道题我算了好多遍但都是这个结果,不知道是题目错了还是我算错了.帮我看一下哪错了?把正确的发上来.
第一部就移错了啊,应该是7/9X=8/9-1/6
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