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(-1/3x+3/4(y的平方))(-3/4y的平方-1/3x)计算
人气:238 ℃ 时间:2020-04-04 07:15:14
解答

(-1/3x+3/4y²)(-3/4y²-1/3x)
=(3/4y²-1/3x)[-(3/4y²+1/3x)]
=-[(3/4y²)²-(1/3x)²]
=1/9x²-9/16y^4
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