Question

如果2x+1=8，那么4x+1就等于

1. A.
   17
2. B.
   15
3. C.
   16
4. D.
   14

Answer 1

B
解：2x+1=8
2x=8-7
x=3.5所以4x+1=4×3.5+1
=14+1
=15选择B