1] 5/7 + 6/5 - 4/6 2] 9/10 + 20% 3] 10/100 + 20% - 40/20

1] 5/7 + 6/5 - 4/6
= 150/210 + 252/210 - 140/210
= 262/210
= 1 52/210
= 1 26/105

2] 9/10 + 20%
= 9/10 + 20/100
= 90/100 + 20/100
= 110/100
= 1 10/100
= 1 1/10

3] 10/100 + 20% - 40/20
= 10/100 + 20/100 - 40/20
= 10/100 + 20/100 - 200/100
= 30/100 - 200/100
= -170/100
= 1 70/100
= 1 7/10

1) 5/7 + 6/5 - 4/6 =150 /210 +252 /210 - 140/210 = 262 /210=126/105
2) 9/10 + 20% =9/10 + 20/100 = 90/100 + 20/100 = 110/100=11/10
3) 10/100 + 20% - 40/20 = 10/100 + 20/100 -40/20 = 10/100 + 20/100 - 200/100 = -170/100 =17/10