（-2xy^2）^2×3x^2y÷（-x^3y^4）
=4x^2y^4×3x^2y÷（-x^3y^4）
=-12x^(2+2-3)y^(4+1-4)
=-12xy
（-2xy^2）^2×3x^2y÷（-x^3y^4）=
（-2xy^2）^2×3x^2y÷（-x^3y^4）=
数学人气：757 ℃时间：2020-04-05 07:29:29
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