Правило,умножаем(делим)мысленно зачёркивая нолики.
800,1000,20,10,234,172
1) 2/4 = 1/2 18/27 = 2/3 4/8 = 1/2 6/15 = 2/5
21/16 = 21/16 10/14 = 5/7 12/21 = 4/7 12/16 = 3/4
3/9 = 1/3 9/12 = 3/4 16/21 = 16/21 18/24 = 3/4
2) 20/16 = 5/4 8/5 = 8/5 12/60 = 1/5 15/131 = 15/131
32/128 =1/4 140/22 = 70/11 7/140 = 1/20 144/12 = 12
35/84 = 5/12 35/15 = 7/3
3) 42/32 = 21/16 36/84 = 3/7 43/98 = 43/98 90/75 = 6/5
27/63 = 3/7 51/85 = 3/5 63/42 = 21/14 17/100 = 17/100
20/36 = 5/9 100/250 = 2/5
Ответ:1)8 13/30+13 24/30-5 25/30+21/30=8+13-5+(13-24-25)/30=16-36/30=16-1,2=14,8.
2) 17 24/32-9 1/32+4 12/32-5 6/32=17-9+4-5+(24-32+12-6)/32=7-2/32=7-1/16=6 15/16.
3) 21 8/30+1 25/30-9 7/30+16+8,75/30=21+1-9+16+(8+25-7+8,75)/30=48+34,75/30= 48+139/120=48+1 19/120=49 19/120.
Пошаговое объяснение:
2.
1) 60:5*2=24(б.) - абрикосы
2) 60-24=36(б.) - вишни и персики
3) 1-3/4=1/4(часть) - персики
4) 36:4*1=9(б) - с персиками
5) 24-9=15(б.) - на столько с абрикосами больше