(x+1)(x+2)(x+3)(x+4)(x+5)的展开式中常数是 ___.
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(x+1)(x+2)(x+3)(x+4)(x+5)
=(x 2 +3x+2)(x 2 +7x+12)(x+5)
=(x 4 +7x 3 +12x 2 +3x 3 +21x 2 +36x+2x 2 +14x+24)(x+5)
=(x 4 +10x 3 +35x 2 +50x+24)(x+5)
=x 5 +10x 4 +35x 3 +50x 2 +24x+5x 4 +50x 3 +175x 2 +250x+120
=x 5 +15x 4 +85x 3 +225x 2 +274x+120,
则(x+1)(x+2)(x+3)(x+4)(x+5)的展开式中常数是:120.
故答案为:120.
=(x 2 +3x+2)(x 2 +7x+12)(x+5)
=(x 4 +7x 3 +12x 2 +3x 3 +21x 2 +36x+2x 2 +14x+24)(x+5)
=(x 4 +10x 3 +35x 2 +50x+24)(x+5)
=x 5 +10x 4 +35x 3 +50x 2 +24x+5x 4 +50x 3 +175x 2 +250x+120
=x 5 +15x 4 +85x 3 +225x 2 +274x+120,
则(x+1)(x+2)(x+3)(x+4)(x+5)的展开式中常数是:120.
故答案为:120.
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