2XY^2×(-3XY)^2=
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2xy-xy-(-3xy)=
(-3xy+2xy)-(4xy+xy)
3xy-3xy-xy+2yx
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
2xy.(-3xy)÷(xy)
(-3xy^2)^2+(-4xy^3)*(-xy)=多少
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
xy-3xy+2xy-xy
2XY^2×(-3XY)^2=
3xy^2*(-2xy)
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
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)
(-4xy^3)×(-xy)+(-3xy^2)^2
(-4xy^3)*(-xy)+(-3xy^2)^2