(-4y+3)--(-5y-2)化简?
化简[21x^5y^7-28x^7y^4+7y(2x³y²)²]÷(-7x^5y^4)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
-(5x+y)-3(2x-3y)(化简)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
5/12[-4/3(x-y)^3] *(x+y)^2 * (-x-y)^3 * 5/6(y-x)^2
2x^2y×(-8y^2)+4x^2y×5y^2
4(2y+3)=8(1-y)-5(y-2)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(3x-y)²-2x(4x-5y)-(x+2y)²
5(y-4)-3(2y+1)等于2(1-2y)-1列方程
当Y等于多少时,(3Y+2)和(5-4Y)是互为相反数?