4.7乘以2.8+3.6乘以9.4怎样简便运算?

题目

4.7乘以2.8+3.6乘以9.4怎样简便运算?

答案

4.7 × 2.8 + 3.6 × 9.4
= 4.7 × 2.8 + 7.2 × 4.7
= 4.7 × (2.8 + 7.2)
= 4.7 × 10
= 47