问题
选择题
xn=2,xm=3,则x3n+2m=( )
A.17
B.36
C.54
D.72
答案
∵xn=2,xm=3,
∴x3n+2m=
=x3n•x2m
=(xn)3•(xm)2
=23×32
=8×9
=72,
故选D.
xn=2,xm=3,则x3n+2m=( )
A.17
B.36
C.54
D.72
∵xn=2,xm=3,
∴x3n+2m=
=x3n•x2m
=(xn)3•(xm)2
=23×32
=8×9
=72,
故选D.