pls help l need it pls pls l will brainliest and nonsense will be report pls help

1.3/10 +4/10 =7/10
2. 4/7 +1/4 =7/10
3.3/4 - 2/4 =1/4
4.5/6 -3/6 =2/6
5. 4/10 + 2/5 = 40/50
6.???
hope it helps