还有几道题要麻烦你(要过程)1.(x-y)的平方*(x+y)+(x+y)的平方*(y-x)2.x的平方-20xy-1500y的平方3.a的平方-2ab+b的平方-3a+3b-4
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![还有几道题要麻烦你(要过程)1.(x-y)的平方*(x+y)+(x+y)的平方*(y-x)2.x的平方-20xy-1500y的平方3.a的平方-2ab+b的平方-3a+3b-4](/uploads/image/z/2079286-70-6.jpg?t=%E8%BF%98%E6%9C%89%E5%87%A0%E9%81%93%E9%A2%98%E8%A6%81%E9%BA%BB%E7%83%A6%E4%BD%A0%EF%BC%88%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%891.%EF%BC%88x-y%29%E7%9A%84%E5%B9%B3%E6%96%B9%2A%EF%BC%88x%2By%EF%BC%89%2B%EF%BC%88x%2By%EF%BC%89%E7%9A%84%E5%B9%B3%E6%96%B9%2A%EF%BC%88y-x%EF%BC%892.x%E7%9A%84%E5%B9%B3%E6%96%B9-20xy-1500y%E7%9A%84%E5%B9%B3%E6%96%B93.a%E7%9A%84%E5%B9%B3%E6%96%B9-2ab%2Bb%E7%9A%84%E5%B9%B3%E6%96%B9-3a%2B3b-4)
还有几道题要麻烦你(要过程)1.(x-y)的平方*(x+y)+(x+y)的平方*(y-x)2.x的平方-20xy-1500y的平方3.a的平方-2ab+b的平方-3a+3b-4
还有几道题要麻烦你(要过程)
1.(x-y)的平方*(x+y)+(x+y)的平方*(y-x)
2.x的平方-20xy-1500y的平方
3.a的平方-2ab+b的平方-3a+3b-4
还有几道题要麻烦你(要过程)1.(x-y)的平方*(x+y)+(x+y)的平方*(y-x)2.x的平方-20xy-1500y的平方3.a的平方-2ab+b的平方-3a+3b-4
1、
原式=(x-y)²(x+y)-(x+y)²(x-y)
=(x+y)(x-y)(x-y-x-y)
=-2y(x+y)(x-y)
2、
原式=x²-50xy+30xy-1500y²
=x(x-50y)+30y(x-50y)
=(x-50y)(x+30y)
3、
原式=(a-b)²-3(a-b)-4
=(a-b-4)(a-b+1)
这几题求什么啊?是化简吗?
1.(x-y)²(x+y)+(x+y)²(y-x)=(x-y)²(x+y)-(x+y)²(x-y)=(x-y)(x+y)(x-y-x-y)
=-2y(x-y)(x+y)
2.x²-20xy-1500y²=(x-50y)(x-30y)貌似是叫十字相乘法来着,记不清鸟
3.a...
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这几题求什么啊?是化简吗?
1.(x-y)²(x+y)+(x+y)²(y-x)=(x-y)²(x+y)-(x+y)²(x-y)=(x-y)(x+y)(x-y-x-y)
=-2y(x-y)(x+y)
2.x²-20xy-1500y²=(x-50y)(x-30y)貌似是叫十字相乘法来着,记不清鸟
3.a²-2ab+b²-3a-3b-4=(a-b)²-3(a+b)-4
收起
1、(x-y)2(x+y)+(x+y)2(y-x)= (x-y) (x+y)(x-y-x-y)=-2y(x-y) (x+y)=2y(x2-y2)=2 x2y-2y3
2、x2-20xy-1500y2= x2-20xy-30*50 y2= (x-50y) (x+20y)
3、a2-2ab+b2-3a+3b-4=(a-b)2-3(a-b)-1*4=(a-b-4) (a-b+1)