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分解因式:(x²-3x)²-2(x²-3x)-8
3a²+a-10也是分解因式
人气:405 ℃ 时间:2020-04-16 03:13:09
解答
(x²-3x)²-2(x²-3x)-8
=(x²-3x-4)(x²-3x+2)(把x²-3x看成一个整体再十字相乘)
=(x-4)(x+1)(x-1)(x-2)
3a²+a-10
=(3a-5)(a+2)
十字相乘
3a ﹣5
×
a 2
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