①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/09/15 03:25:11

①2x^2-(x+2)(x-2)-(x+1)^2 ②（2x-y)(4x^2+y^2)(2x+y）③（-2xy^2）(1/4x^3y)^2
④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)急高手帮帮忙!

①2x^2-(x+2)(x-2)-(x+1)^2
=2x^2-(x^2-4)-(x^2+2x+1)
=2x^2-x^2+4-x^2-2x-1
=-2x+3
②（2x-y)(4x^2+y^2)(2x+y）
=（2x-y)(2x+y）(4x^2+y^2)
=(4x^2-y^2)(4x^2+y^2)
=16x^4-y^4
③（-2xy^2）(1/4x^3y)^2
=（-2xy^2）(1/16x^6y^2)
=-1/8 x^7 y^4
④4a^2x^2(-2/5a^4x^2y^3)÷(-1/5a^5x^4y^2)
=-8/5a^4 x^4 y^3)÷(-1/5a^5x^4y^2)
=8a^(-1) y

1、x(x-y)(x+y)-x(x+y)^2 x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y (1)(x^2/x)-y-x-y 因式分解：x×x-xy-2y×y-x-y 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算（xy-x^2)乘以(xy)/(x-y) （1）x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2 (x+y-2xy)(x+y-2)+(1-xy)² x-y/x²÷x²-2xy+y²/xy*（xy-x²）多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2