(-4x-y)(-5x+2y)
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(-4x-y)(-5x+2y)(-4x-y)(-5x+2y)(-4x-y)(-5x+2y)(-4x-y)(-5x+2y)=(4x+y)(5x-2y)=20x^2-8xy+5xy-2y^2=20x^2-
(-4x-y)(-5x+2y)
(-4x-y)(-5x+2y)
(-4x-y)(-5x+2y)
(-4x-y)(-5x+2y)
=(4x+y)(5x-2y)
=20x^2-8xy+5xy-2y^2
=20x^2-3xy+2y^2
=20*x平方-3xy-2*y平方
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
[(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)请帮我一下写两道计算题[(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以(4x)
4x+2y-5x-y
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
{(x²+y²)-(x-y)+2y(x-y)}/4y
(-4x-y)(-5x+2y)
合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4
2x^2y×(-8y^2)+4x^2y×5y^2
-(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y)
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
计算:(3x+4y)(3x-4y)-5(x+y)(x-2y)
x+2y=3(x+y)+5 3x-4y=4(x+y)-15
5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2]
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²
[(2x+y)^2-(x+y)(x-4y)-5y^2]除以2x
y'=(y/x)^2+y/x+4微分方程
(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算