(7/25×2/3+2/3×18/25)÷2/3 (11/14-5/7+5/28)×28 2/7×(1÷3/4-3/4÷1) 用简便方法计算
问题描述:
(7/25×2/3+2/3×18/25)÷2/3 (11/14-5/7+5/28)×28 2/7×(1÷3/4-3/4÷1) 用简便方法计算
答
(7/25×2/3+2/3×18/25)÷2/3
= 2/3(7/25+18/25)×3/2
= 25/25 = 1
(11/14-5/7+5/28)×28
= (22/28-20/28+5/28)×28
= 7/28 × 28 = 7
2/7×(1÷3/4-3/4÷1)
=2/7 ×(1×4/3-3/4×1)
=2/7 × 7/12 = 1/6