数学题6y^2 - 9y +5 - y^2+4y - 5y^2
人气:111 ℃ 时间:2019-10-19 19:17:08
解答
6y²-9y+5-y²+4y-5y²
=(6-1-5)y²+(4-9)y+5
=-5y+5
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