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初二数学题,分解因式(x+1)(x+3)(x+5)(x+7)+16,快点啦
人气:421 ℃ 时间:2020-05-23 05:24:12
解答
=[(x+1)(x+7)][(x+3)(x+5)]+16
=[(x²+8x)+7][(x²+8x)+15]+16
=(x²+8x)²+22(x²+8x)+105+16
=(x²+8x)²+22(x²+8x)+121
=[(x²+8x)+11]²
=(x²+8x+11)²
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