2⼀1 X 3⼀1 +12⼀5 X 2⼀1 求答案 5⼀4 X7⼀5 -2⼀1 (6+15⼀2)X5 求答案

2025-05-17 09:38:51
推荐回答(1个)
回答(1):

二分之一写作1/2

1/2x1/3+5/12x1/2
=1/6+5/24
=4/24+5/24
=9/24
=3/8

4/5x5/7-1/2
=4/7-1/2
=8/14-7/14
=1/14

(6+2/15)x5
=6x5+2/15x5
=30+2/3
=30又2/3