已知2x=8,那么4x+2×0.8=(  ) A.14.4 B.0.4 C.17.6 D.18

问题描述:

已知2x=8,那么4x+2×0.8=(  )
A. 14.4
B. 0.4
C. 17.6
D. 18

由2x=8得x=4,
将x=4代入4x+2×0.8,
得4×4+2×0.8,
=16+1.6,
=17.6;
故选:C.