{y=3x-7{5x+2y=8{x-2y=3{2y+x=-1{2y-x=6{2x+y=8
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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)
(2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y)其中x=2,y=5
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2
3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项.
5(x-y)^2-(x-y)-8(x-y)^2-3(x-y)
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
{y=3x-7{5x+2y=8{x-2y=3{2y+x=-1{2y-x=6{2x+y=8
化简3(x-y)-7(x--y)+2(y-x)
化简:5(x-y)+2(x+y)-3(x-y)
已知X=11Y,(X-2)*3=Y,(X-4)*5=Y,(X-6)*7=Y,(X-8)*9=Y ,求X、Y各是多少?
先化简,再求值.2(x-2y)^2+8(x-2y)-3(2y-x)^2+5(2y-x),其中-x+2y=-3RT为什么-3(2y-x)^2=3(x-2y)²?
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(2x-3y)-(5x-y)