-(2xy)^3+(-3xy)^3 (5ab)^2+(3ab)^2 8^2012*1/8^2013-(2xy)^3+(-3xy)^3 (5ab)^2+(3ab)^28^2012*1/8^2013(-4a^2)^3+(-4a^3)^2-x^21+-x21-a·a^5-(a^2)^3-(-2a^3)^2
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(-3xy+2xy)-(4xy+xy)
3xy-3xy-xy+2yx
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
2xy.(-3xy)÷(xy)
2xy-xy-(-3xy)=
2xy(5xy的2次方+3xy-1)
2xy(5xy的2次方+3xy-1)
xy×(xy)²-3xy
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
xy-3xy+2xy-xy
3xy^2*(-2xy)
3(xy-xy)-2(xy+xy)+3xy
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
(-4xy^3)×(-xy)+(-3xy^2)^2
(-3xy^2)^2+(-4xy^3)*(-xy)=多少
(-4xy^3)*(-xy)+(-3xy^2)^2
(3xy^2)^2+(-xy^3)(4xy)