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数学
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如果多项式2a的2次方-3a+4的值为3,求多项式4a的2次方-6a-5的值
人气:293 ℃ 时间:2019-08-17 23:04:55
解答
答案:-7
2a^2-3a+4=3
则,2a^2-3a=-1
则,4a^2-6a=-2
则,4a^2-6a-5=-2-5=-7
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