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`a,`
`34,67+5,42+4,58`
`= 34,67+(5,42+4,58)=34,67+10=44,67`
`b,`
`15,27 \times 2 \times 0,5`
`= 15,27 \times (2 \times 0,5)`
`= 15,27 \times 1=15,27`
`c,`
`45,28 \times 45 + 45,28 \times 55`
`= 45,28 \times (45+55)`
`= 45,28 \times 100=4528`
a.
34,67 + 5,42 + 4,58
= (34,67 + 5,42) + 4,58= 40,09 + 4,58 = 44,67
b. 15,27 x 2 x 0.5
= (15,27 x 2) x 0.5 = 30,54 x 0,5 = 15,27
c. 45,28 x45 + 45,28 x 55
= 45,28 x (45 + 55)
= 45,28 x 100 = 4528
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
= ( 45,28 + 52,17) + (16,28 - 12,1)
= 97,45 + 4,18
= 101,63
45,28 + 52,17+15,28 - 12,1
=(45,28+52,17)+(16,28-12,1)
= 97,45 + 4,18
= 101,63
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
45,28 + 52,17 - 15,28 - 12,17
= (45,28 - 15,28) + (52,17 - 12,17)
= 30 + 40
= 70
![](https://rs.olm.vn/images/avt/0.png?1311)
45,28+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
\(45,28=53,12-15,68:\left(a-5\right)\)
\(53,12-45,28=15,68:\left(a-5\right)\)
\(7,84=15,68:\left(a-5\right)\)
\(15,68:7,84=a-5\)
\(2=a-5\)
\(2+5=a\)
\(7=a\)
vậy a = 7