1.(2X+3Y+5)(2X+3Y—5)
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(x+y)^5+2(-x—y)^3·(x+y)²;
计算:(3x-y)2-(2x+y)2+5x(y-x)
(3x-y)²-2x(4x-5y)-(x+2y)²
((x+2y)x^2+(x-y)(3x-y)-5y^2)÷2x
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
先化简再求值 :[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x=—2,y=5
数学(x-y)^5*(y-x)^3*(x-y)^2
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
-(5x+y)-3(2x-3y)(化简)