{X:Y=3:2,Y:2=5:4,X+Y+Z=60
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{X:Y=3:2,Y:2=5:4,X+Y+Z=60{X:Y=3:2,Y:2=5:4,X+Y+Z=60{X:Y=3:2,Y:2=5:4,X+Y+Z=60x=15/4y=5/2z=215/4x=15/4,
{X:Y=3:2,Y:2=5:4,X+Y+Z=60
{X:Y=3:2,Y:2=5:4,X+Y+Z=60
{X:Y=3:2,Y:2=5:4,X+Y+Z=60
x=15/4
y=5/2
z=215/4
x=15/4,y=5/2,z=215/4
x=15/4
y=5/2
z=215/4
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
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3x(2x+y)-2x(x-y),其中x=1,y=1/5
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(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算
5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解
5x^3y(x-y)^3-10x^4y^3(y-x)^2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
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)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=5,Y=2
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=5,Y=2
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=-2,Y=-3