pake cara dah tolong disederhanakan

no5. 6+1/3=18/3 + 1/3 = 19/3 = 6 1/3
no6. 1/3+2 3/4 = 1/3+11/4 = 4/12 + 33/12 = 37/12 = 3 1/12
no7. 2/5+1 1/4= 2/5 + 5/4 = 8/20 + 25/20 = 33/20 = 1 13/20