3(xy-xy)-2(xy+xy)+3xy
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xy-3xy+2xy-xy
3(xy-xy)-2(xy+xy)+3xy
(-3xy+2xy)-(4xy+xy)
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.
【x(xy-xy)-y(x-xy)】÷3xy
3xy-3xy-xy+2yx
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
2xy.(-3xy)÷(xy)
2xy-xy-(-3xy)=
xy×(xy)²-3xy
2x²y-3(2xy-xy)-xy
因式分解X^3-2xy+xy^2
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
3xy^2*(-2xy)
x+y=3Xy,求X+y+2Xy分之2X+2y-Xy的值是多少?
已知x+y=3 xy=-2 求代数式 (3xy+10y)+[5x-(2xy+2y-3x)]的值