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先化简再求值:[(x+3y)(x-3y)-(x+3y)^2]÷4y
人气:355 ℃ 时间:2020-09-19 04:50:51
解答
[(x+3y)(x-3y)-(x+3y)^2]÷4y
=[(x²-9y²)-(x²+9y²+6xy)]÷4y
=(x²-9y²-x²-9y²-6xy)÷4y
=-6xy÷4y
=-3x/2
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