34 34 21 15 7342134157 = 15 19 7 20 30.25...
Câu 1
34
34
21
15
7
34
21
34
15
7
=15
19
7
20
3
0.25 =1 – 1 +3
7
=3
7
1
3
d) 6 – 3.
= 6 – 3 .1
27
3
= 6 +1
9
=55
9