-xy∧2÷3xy=?
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-xy∧2÷3xy=?
2xy.(-3xy)÷(xy)
xy-3xy+2xy-xy
(-3xy+2xy)-(4xy+xy)
3(xy-xy)-2(xy+xy)+3xy
3xy-3xy-xy+2yx
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
2xy-xy-(-3xy)=
【x(xy-xy)-y(x-xy)】÷3xy
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
3xy^2*(-2xy)
(3x²y-xy²+1/2xy)÷(-1/2xy)=?
xy×(xy)²-3xy
若xy=-2 求-xy(xy的7次方-3xy的5次方-5y)的值
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
3xy-4xy-(-2xy)求过程