kakak bantu pake cara besok dikumpul

a. 4/5 + 3/5 - 2/5 = 7/5 - 2/5 = 5/5 = 1
b. 3/8 - 7/8 × 14/3 = 3/8 - 7/4 × 7/3 = 49/12 = 4 1/12
c. 5/6 ÷ 3/9 + 7/10 = 5/6 × 9/3 + 7/10 = 5/2 × 3/3 + 7/10 = 15/6 + 7/10 = 75/30 + 21/30 = 96/30 = 3 6/30 = 3 2/15