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数学
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分解因式:7(x-1)²+4(x-1)-20
人气:357 ℃ 时间:2020-06-09 00:58:35
解答
将x-1看成一个整体,然后十字相乘
12
7 -10
∴ 7(x-1)²+4(x-1)-20
=[(x-1)+2]*[7(x-1)-10]
=(x+1)(7x-17)
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