Bài 1: Tính
a,4 - 7/7 = 4 - 1 = 3 b,5 - 17/19 = 95/19 - 17/19 = 78/19
c,35/11 - 2 = 35/11 - 22/11 = 13/11 d,68/17 - 3 = 68/17 - 51/17 = 17/17 = 1
Bài 2: Tính
a,2/3 + 4/5 = 10/15 + 12/15 = 22/15 b,15/25 + 6/21 = 3/5 + 2/7 = 21/35 +10/35 = 31/35
c,4/3 - 11/15 = 12/15 - 11/15 = 1/15 d,12/10 - 2/5 = 6/5 - 2/5 = 4/5
Bài 3: Tìm x
a,x + 2/3 = 4/3 b,x - 5/3 = 17/18
x = 4/3 - 2/3 x = 17/18 + 5/3
x = 2/3 x = 47/18
c,9/5 - x = 7/15
x = 9/5 - 7/15
x = 4/3