2⼀9x3⼀8÷2⼀7。3⼀4x5⼀6+3⼀4x1⼀6。21⼀5÷7x5⼀9。

2024-12-03 01:56:53
推荐回答(1个)
回答1:

2/9×3/8÷2/7
=1/12÷2/7
=1/12×7/2
=7/24
3/4x5/6+3/4×1/6
=3/4×(5/6+1/6)
=3/4×1
=3/4
21/5÷7×5/9
=3/5×5/9
=1/3