Question

6.5与3的积加上一个数的3倍，和是31.2，这个数是多少？

Answer 1

31.2-6.5x3=11.7 11.7÷3=3.9

Answer 2

31.2-6.5*3=11.7

追答

11.7/3=3.9

Answer 3

6.5×3=19.5
31.2-19.5=11.7
11.7÷3=3.9

Answer 4

（31.2-6.5×3）÷3=3.9

Answer 5