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数学
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分解因式:(x+1)(x+2)(x+3)(x+4)-120=______.
人气:173 ℃ 时间:2020-05-11 20:59:10
解答
(x+1)(x+2)(x+3)(x+4)-120
=(x
2
+5x+6)(x
2
+5x+4)-120
=(x
2
+5x)
2
+10(x
2
+5x)+24-120
=(x
2
+5x)
2
+10(x
2
+5x)-96
=(x
2
+5x+16)(x
2
+5x-6)
=(x
2
+5x+16)(x+6)(x-1).
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