简便运算:① 9.8÷14 ②(6.4+3.2)÷8 ③ 35÷(0.35×4) ④ 63.2×0.1+6.32×9

问题描述:

简便运算:① 9.8÷14 ②(6.4+3.2)÷8 ③ 35÷(0.35×4) ④ 63.2×0.1+6.32×9