[(2+xy)(xy-2)+(-xy-2)的平方]其中x=6,y=-3分之2
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(-3xy+2xy)-(4xy+xy)
3xy-4xy-(-2xy)
1.3xy -4xy-(2xy)
3xy-3xy-xy+2yx
3xy-4xy-(-2xy)
2xy.(-3xy)÷(xy)
2xy-xy-(-3xy)=
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
xy-3xy+2xy-xy
3xy^2*(-2xy)
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
3(xy-xy)-2(xy+xy)+3xy
1/2xy(2/3xy²-2xy)
3(xy-z)^2-(2xy+z)(-z+2xy)
2x²y-3(2xy-xy)-xy
2xy(5xy的2次方+3xy-1)
2xy(5xy的2次方+3xy-1)
(-4xy^3)×(-xy)+(-3xy^2)^2