(-1/2xy^2)^2(3xy-4xy^2+1)
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(-1/2xy^2)^2(3xy-4xy^2+1)(-1/2xy^2)^2(3xy-4xy^2+1)(-1/2xy^2)^2(3xy-4xy^2+1)(-1/2xy^2)^2(3xy-4xy^2+1)
(-1/2xy^2)^2(3xy-4xy^2+1)
(-1/2xy^2)^2(3xy-4xy^2+1)
(-1/2xy^2)^2(3xy-4xy^2+1)
(-1/2xy^2)^2(3xy-4xy^2+1)
=(1/4)x^2·y^4·(3xy-4xy^2+1)
=(3/4)x^3·y^5 - x^3·y^6 +(1/4)x^2·y^4
(-3xy+2xy)-(4xy+xy)
3xy-4xy-（-2xy）
3xy-4xy-（-2xy）
（1）3xy-4xy-(-2xy)
3xy-3xy-xy+2yx
1.3xy -4xy-(2xy)
2xy.(-3xy)÷(xy)
2xy-xy-(-3xy)=
[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)
xy－3xy＋2xy－xy
1/2xy(2/3xy²-2xy)
(-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)
3xy^2*(-2xy)
2xy(5xy的2次方+3xy-1)