x^3+y^2-5=7,则2x^3+2y^2+4=?
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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
化简3(x-y)-7(x--y)+2(y-x)
化简:5(x-y)+2(x+y)-3(x-y)