问题
选择题
计算(x2-xn-1-x1+n)3的结果为( )
A.x3n+3
B.x6n+3
C.x12n
D.x6n+6
答案
原式=x6•x3n-3•x3+3n,
=x6+3n-3+3+3n,
=x6n+6.
故选D.
计算(x2-xn-1-x1+n)3的结果为( )
A.x3n+3
B.x6n+3
C.x12n
D.x6n+6
原式=x6•x3n-3•x3+3n,
=x6+3n-3+3+3n,
=x6n+6.
故选D.