Bài 3:
a) =1/12 - -5/12
= 1/2
b) =(1/2+ -1/3+-5/6) +1/23
= 0 +1/23= 1/23
c) 10/3 . 0,25= 5/6
d) = -3/7 +4/11 : 7/11 + -4/7+7/11 :7/11
= -3/7+ 4/7+4/7+1
= 12/7
e) 6/5 : {2/5+ 7/6 : 13/2}
6/5 : 195/113 = 234/113
g) 11/20 . -2/5= -11 /50
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