<span>а) 1/2+ 1/4 = 2/4 + 1/4 = 3/4
1/2+5/6 = 3/6 + 5/6 = 8/6 = 4/3 = 1 1/3
1/4+5/6 = 3/12 + 10/12 = 13/12 = 1 1/12
б)3/4-1/12 = 9/12 - 1/12 = 8/12 = 2/3
5/7-2/3 = 15/21 - 14/21 = 1/21
9/10 - 3/4</span> = 18/20 - 15/20 = 3/20
Этот знак : цифра
==============$$$
41/20 = 2 целых 1/20 = 2 5/100 = 2,05 - доп.множ. 5
63/40 = 1 целая 23/40 = 1 575/1000 = 1,575 - доп.множ. 25
23/25 = 92/100 = 0,92 - доп.множ. 4
101/100 = 1 целая 1/100 = 1,01
17/50 = 34/100 = 0,34 - доп.множ. 2
31/20 = 1 целая 11/20 = 1 55/100= 1,55 - доп.множ. 5
3 2/5 = 3 4/10 = 3,4 - доп.множ. 2
5 3/8 = 5 375/1000 = 5,375 - доп.множ. 125
6 1/6 = 6 + (1 : 6) = 6 + 0,1666... = 6,1(6)
11 4/25 = 11 16/100 = 11,16 - доп.множ. 4
6т 288кг=6288кг
1)6288-2590=3698кг- осталось
2)3698/86=43кг- в каждом ящике