(5x+7y-2)(5x-7y+2)化简是什么?急
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(5x+7y-2)(5x-7y+2)化简是什么?急
(5x+7y-2)(5x-7y+2)化简是什么?急
(5x+7y-2)(5x-7y+2)化简是什么?急
(5x+7y-2)(5x-7y+2)=(5x)²-(7y-2)²=25x²-49y²+28y-4
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
化简2(2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
化简3(x-y)-7(x--y)+2(y-x)
化简:5(x-y)+2(x+y)-3(x-y)
把(x-y)看作一个整体,化简:(1)5(x-y)+2(x-y)-4(x-y);(2)3(x-y²-4(x-y)+7(x-y)-6(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
化简{21x^5y^7-28x^7y^4+7y(2x^3y^2)^2}/(-7x^5y^4)
化简[21x^5y^7-28x^7y^4+7y(2x³y²)²]÷(-7x^5y^4)
合并同类项:-3x+2y-5x-7y
{x+y=7 {2x-5y=-21
因式分解:5(x-y)^2+7(x-y)-6