Bài 1:
a, 24 + 567 : 7 - 15
= 24 + 81 - 15
= 105 - 15
= 90
b, 197 - 13 x 8 + 768
= 197 - 104 + 768
= 93 + 768
= 861
c, 236 + 549 : 9 - 24 x 5
= 236 + 61 - 120
= 297 - 120
= 177
Bài 2:
a, 7/12 + 3/14 x 1/1/6 - 1/4/11 : 2/1/22
= 7/12 + 3/14 x 7/6 - 15/11 : 45/22
= 7/12 + 1/4 - 2/3
= 7/12 + 3/12 - 8/12
= 1/6
b, 1/4/5 x 7/18 + 4/19 : 5/38 - 1/3/10
= 9/5 x 7/18 + 4/19 : 5/38 - 13/10
= 7/10 + 8/5 - 13/10
= 7/10 + 16/10 - 13/10
= 1
c, 11/5 : 16/1/2 + 4/9 : 1/1/3 - 2/5
= 11/5 : 33/2 + 4/9 : 4/3 - 2/5
= 2/15 + 1/3 - 2/5
= 2/15 + 5/5 - 6/15
= 1/15
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