1+2x-26x^2
1*1=1
[5*(-2)*1+4*3*1]*x=2x
[(5*4/2)*2^2+5*(-2)*4*3+(4*3/2)*3^2]x^2=[40-120+54]x^2=-26x^2
求(1-2X)的5次幂乘以(1+3X)的4次幂的展开式中按X的升幂排列的前3项
求(1-2X)的5次幂乘以(1+3X)的4次幂的展开式中按X的升幂排列的前3项
数学人气：526 ℃时间：2020-01-25 07:24:35
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