简算 1⼀2*2⼀5+3⼀5除以3⼀4 (3⼀4-3⼀4*2⼀5)除以1⼀5

2024-12-27 04:31:22
推荐回答(1个)
回答1:

1/2*2/5+3/5除以3/4
=1/2*2/5+3/5÷3/4
=1/5+3/5×4/3
=1/5+4/5
=1

(3/4-3/4*2/5)除以1/5
=(3/4-3/10)÷1/5
=9/20×5
=9/4
=2又1/4