原式=C50(x-1)5+C51(x-1)4+C52(x-1)3+C53(x-1)2+C54(x-1)+C55-1
=[1+(x-1)]5-1=x5-1
故选A.
(x-1)5+5(x-1)4+10(x-1)3+10(x-1)2+5(x-1)等于( ) A.x5-1 B.x5 C.x5+1 D.(x-1)5-1
(x-1)5+5(x-1)4+10(x-1)3+10(x-1)2+5(x-1)等于( )
A. x5-1
B. x5
C. x5+1
D. (x-1)5-1
A. x5-1
B. x5
C. x5+1
D. (x-1)5-1
数学人气:743 ℃时间:2019-08-17 03:27:15
优质解答
我来回答
类似推荐