Question

va rog din suflet. a)2/7+?=5/7; ?+3/8=7/8; 4/9+?=1; b)?+1/10=1; 8/9-?=2/9; 5/6-?=4/6; c)?-2/11=6/11; ?-2/7=4/7; ?-3/5=2/5; d)1/4+?=1; 1-?=1/6; 1-?=2/3;

Answer 1

2/7 + 3/7= 5/7
4/8 + 3/8= 7/8
4/9 + 5/9= 9/9= 1
9/10 + 1/10= 10/10= 1
8/9 -6/9= 2/9
5/6 - 1/6= 4/6
8/11 - 2/11= 6/11
6/7- 2/7= 4/7
5/5 - 3/5= 2/5
1/4 + 3/4= 4/4= 1
1- 5/6=1/6 = 6/6-5/6=1/6
1 - 1/3= 2/3 = 3/3-1/3=2/3