Question

8/5×7+8/1×5用简便方法计算 6/5×25-6/1×85 简便计算

Answer 1

8/5×7+8/1×5
=8/5×（7+1）
=8/5×8
=5
6/5×25-6/1×85
=6/5×（25-17）
=6/5×8
=3/20