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a: =-48+27+56-48-27-36
=-96-9
=-105
b: =23-57+57-33
=-10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =-48+27+56-48-27-36
=-96+20
=-76
b: =23-57+57-33=-10
c: =-98+12-159-12-41
=-98-200
=-298
![](https://rs.olm.vn/images/avt/0.png?1311)
42 + 45 + 48 + ... + 57
\(=\left(42+57\right)+\left(45+54\right)+\left(48+51\right)\)
\(=99+99+99\)
\(=99.3\)
\(=297\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(57=3.19\)
\(48=2^4.3\)
\(27=3^3\)
\(\Rightarrow UCLN\left(57,48,27\right)=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -(-15) + 67 - 80 - 167 + 20
= 15 + 67 - 80 - 167 + 20
= 15 + (67 - 167) - (80 + 20)
= 15 + (-100) - 100
= 15 - 100 - 100
= -85 - 100
= -185
b) (-192) + (-51) + (-48) + 21
= -192 - 51 - 48 + 21
= (-192 - 48) - (51 - 21)
= -240 - 30
= -270
c) -(57 - 412) + (-21 + 57 + 200)
= -57 + 412 - 21 + 57 +200
= (-57 + 57) + (412 + 200) - 21
= 0 + 612 - 21
= 612 - 21
= 591
![](https://rs.olm.vn/images/avt/0.png?1311)
3x - 57 = -48
3x = -48 + 57
3x = 9
x = 3
Tk mk nha
3x - 57 = -48
3x = -48 + 57
3x = 9
x = 3
happy new year