2y²+3y+7=9,则4y²+6y-1的值是_.我要讲解,
人气:241 ℃ 时间:2019-12-09 07:40:06
解答
2y²+3y+7=9
2y²+3y=2,两边同时乘以2
4y²+6y=4,两边同时减去1
4y²+6y-1=3
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