(25分之17×50分之9)×17分之30×125
17/25 × 9/50 × 30/17 × 125
= 17/25 × 30/17× 125 × 9/50
= 30/25 × 5 × 9 /2
= 6 × 9/2
= 3×9=27
29*29分之28+27*27分之28
29× 28/29 + 27× 28/27
= 28 + 28
= 40 +16
= 56
(25分之17×50分之9)×17分之30×125
17/25 × 9/50 × 30/17 × 125
= 17/25 × 30/17× 125 × 9/50
= 30/25 × 5 × 9 /2
= 6 × 9/2
= 3×9=27
29*29分之28+27*27分之28
29× 28/29 + 27× 28/27
= 28 + 28
= 40 +16
= 56