简便计算:48x27⼀49,9×(1⼀9+1⼀7)x7,7⼀8+7⼀8x99,5⼀9x1⼀8X27

2024-11-21 23:28:30
推荐回答(2个)
回答1:

回答2:

48x27/49
=(49-1)×27/49
=49×27/49-27/49
=27-27/49
=26又22/49

9×(1/9+1/7)x7
=9×1/9×7+9×1/7×7
=7+9
=16

7/8+7/8x99
=7/8×(1+99)
=7/8×100
=7/2 ×25
=175/2

5/9x1/8X27
=5/9×27 ×1/8
=15×1/8
=15/8