(1+3x)(1+2x)^2(1+x)^3展开,合并同类项后x^3系数为?
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(1+3x)(1+2x)^2(1+x)^3展开,合并同类项后x^3系数为?
(1+3x)(1+2x)^2(1+x)^3展开,合并同类项后x^3系数为?
(1+3x)(1+2x)^2(1+x)^3展开,合并同类项后x^3系数为?
(1+3x)(1+2x)^2(1+x)^3
=(1+3x)(1+4x+4x^2)(1+3x+3x^2+x^3)
含x^3的有x^3+4x*3x^2+4x^2*3x+3x*3x^2*+3x*4x*3x+3x*4x^2*
=(1+12+12+9+36+12)x^3
=82x^3
x^3的系数是82
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(1+3x)(1+2x)^2(1+x)^3
=(1+3x)(1+4x+4x^2)(1+3x+3x^2+x^3)
含x^3的有x^3+4x*3x^2+4x^2*3x+3x*3x^2*+3x*4x*3x+3x*4x^2*
=(1+12+12+9+36+12)x^3
=82x^3
x^3的系数是82
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