7x+[-3x-3(x-2y)]-[5x-(2x-y)]
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
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
去括号并合并同类项(1)3x-2(x+7)+2(2x+5) (2)(4x-3y)-[-(3y-x)+(x-y)]-5x
(x-y)(x-2y)-(3x-2y)(x-3y)
数学(x-y)^5*(y-x)^3*(x-y)^2
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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)