7/9×（4.85÷5/18-3.6+6.15×33/5（带分数,三又五分之三）速算,要速算,求讲方法和讲解

Question

7/9×（4.85÷5/18-3.6+6.15×3 3/5（带分数,三又五分之三）
速算,要速算,求讲方法和讲解

Answer 1

7/9×（4.85÷5/18-3.6+6.15×3 又3/5）
=7/9×（4.85×3.6-3.6+6.15×3.6）
=7/9×3.6×(4.85-1+6.15)
=2.8×10
=28