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(3+x)^n的展開式的係數和是x=1時的值,即4^n (1+y)^m的展開式的係數和是y=1時的值,即2^m 即有:4^n=2^m* 512 故2^(2n)=2^(m+9) 即2n=m+9 即2n-m=9
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