а)3/36+7/9 б)2/5+3/20 в)1/6+5/12 г)2/3+5/6 д)13/24+5/8 е)3/8+6/32 ж)6/120+3/20 з)9/16+50/100

Чтобы вычислить значение выражений, приведем дроби к общему знаменателю:

1) 3/36 + 7/9 = 3/36 + (7 * 4)/36 = 3/36 + 28/36 = (3 + 28)/36 = 31/36;

2) 2/5 + 3/20 = (2 * 4)/20 + 3/20 = 8/20 + 3/20 = (8 + 3)/20 = 11/20;

3) 1/6 + 5/12 = (1 * 2)/12 + 5/12 = 2/12 + 5/12 = 7/12;

4) 2/3 + 5/6 = (2 * 2)/6 + 5/6 = 4/6 + 5/6 = 9/6 = 1 3/6 = 1 1/2;

5) 13/24 + 5/8 = 13/24 + (5 * 3)/24 = 13/24 + 15/24 = 28/24 = 1 4/24 = 1 1/6;

6) 3/8 + 6/32 = (3 * 4)/32 + 6/32 = 12/32 + 6/32 = 18/32 = 9/16;

7) 6/120 + 3/20 = 1/20 + 3/20 = 4/20 = 1/5;

8) 9/16 + 50/100 = 9/16 + 50/(2 * 50) = 9/16 + 1/2 = 9/16 + 8/16 = 17/16 = 1 1/16.