Question

15. Выполните действия и сравните результаты. а) ( 12:3 3/5+2/3)*2/3 б) (19/21:1 1/21) : (38/41:2/41) с) (13 2/7-5 3/14) : 2 11/51 д) (5 1/3:3 1/5) : (6 1/2:2 1/6)​

Answer 1

а)(12:3 31/5 + 2/3) ×2/3=(4×3/5+2/3)×2/3=(12/5+2/3)×2/3=46/15×2/3=92/45

б)(19/21:1 1/21) : (38/41:2/41)=(19/21:22/21):(38/41×41/2)=(19/21×21/22):19=(19×1/22)×1/19=19/22×1/19=1/22=22

с)(13 2/7-5 3/14) : 2 11/51 =(93/7-73/14)×1/2×11/51=113/14×1/2×11/51=1243/1428

д)(5 1/3:3 1/5) : (6 1/2:2 1/6)(16/3×1/3×1/5):(13/2×1/2×1/6)=16/45:13/24=16/45×24/13=16/15×8/13=128/195