B1:
8/17:5/19+9/17:5/19-24/5
29/15.3/2+29/15:7/4
-8/15.3/7-8/15:7/4-1/15
7/13+6/13.(-1/2+2/3)
1,75.7/23-13/23.7/4-1 và ¾.17/23
B2
(2/15-x).1/3=2/5
(1/5-x):1/3=4/5
2x-1/12-3/4=-2/3
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