2xy-xy-(-3xy)=
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2xy-xy-(-3xy)=2xy-xy-(-3xy)=2xy-xy-(-3xy)=4xy4xy4xy
2xy-xy-(-3xy)=
2xy-xy-(-3xy)=
2xy-xy-(-3xy)=
4xy
4xy
4xy
2xy-xy-(-3xy)=
(-3xy+2xy)-(4xy+xy)
(-3xy^2)^2+(-4xy^3)*(-xy)=多少
3xy-3xy-xy+2yx
4xy+6xy-3xy=?
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
2xy.(-3xy)÷(xy)
2XY^2×(-3XY)^2=
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
xy-3xy+2xy-xy
3xy^2*(-2xy)
6xy/3xy=?
xy×(xy)²-3xy
xx+xy=xy,xy
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
xy
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)