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先化简,再求徝:(5y+1)(5y-1)-(5y+25y²),其中y=2/5
人气:392 ℃ 时间:2020-06-03 17:52:22
解答
:(5y+1)(5y-1)-(5y+25y²)
=25y²-1-5y-25y²
=-1-5y
=-1-5x2/5
=-3对的吗?老班要通缉的对的哦,三克油啦☆☆
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