7/9×(4.85÷5/18-3.6+6.15×3 3/5(带分数,三又五分之三)

问题描述:

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

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