75%÷6分之5×3分之2÷7分之2简便计算.
问题描述:
75%÷6分之5×3分之2÷7分之2简便计算.
比28的7分之3多80%的数是多少?
答
(1)75%÷5/6×2/3÷2/7
=3/4×2/3×6/5×7/2
=1/2×6/5×7/2
=3/5×7/2
=21/10
(2)28×3/7=12
12×(1+80)
=12×9/5
=108/5
=21.6