一、
1. 10/3   18/25   2
     2      1/9     10/3

2.
7/12×4/5+11/5×7/12
=(4/5+11/5)×7/12
=3×7/12
=7/4

(21+7/12)÷7/3
=21×3/7+7/12×3/7
=9+1/4
=37/4

32/33×34
=32/33×33-32/33
=32-32/33
=1024/33

[1-(3/4-2/5)]×25/26
=[1/4+2/5]×25/26
=13/20×25/26
=5/8

2/3+5/18×4/5+7/9
=2/3+2/9+7/9
=5/3

(1/6-1/7)÷1/42
=1/42×42
=1

2/7÷(8/9×2/7)÷8/9
=2/7×9/8×7/2×9/8
=1

[7/11-(8/15-4/11)]÷14/45
=[1-8/15]×45/14
=7/15×45/14
=3/2

二、

比	25:60	1.25:5	5/6:4/9	18分:3/4时
化简后的比	5:12	1:4	15:8	2:5
比值	5/12	1/4	15/8	2/5

一、
1. 10/3   18/25   2
     2      1/9     10/3

2.
7/12×4/5+11/5×7/12
=(4/5+11/5)×7/12
=3×7/12
=7/4

(21+7/12)÷7/3
=21×3/7+7/12×3/7
=9+1/4
=37/4

32/33×34
=32/33×33-32/33
=32-32/33
=1024/33

[1-(3/4-2/5)]×25/26
=[1/4+2/5]×25/26
=13/20×25/26
=5/8

2/3+5/18×4/5+7/9
=2/3+2/9+7/9
=5/3

(1/6-1/7)÷1/42
=1/42×42
=1

2/7÷(8/9×2/7)÷8/9
=2/7×9/8×7/2×9/8
=1

[7/11-(8/15-4/11)]÷14/45
=[1-8/15]×45/14
=7/15×45/14
=3/2

二、

比	25:60	1.25:5	5/6:4/9	18分:3/4时
化简后的比	5:12	1:4	15:8	2:5
比值	5/12	1/4	15/8	2/5