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a (18+29)+(158-18-29)=18+29+158-18-29=158
b,(13-135+49)-(13+49)=13-135+49-13-49=-135
(18+29)+(158-18-29)
=18+29+158-18-29
=158+(18-18)+(29-29)
=158+0+0
=158
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.=24+42+120-24-42\)
\(=\left(24-24\right)+\left(42-42\right)+120\)
\(=0+0+120\)
\(=120\)
\(b.=13-145+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-145\)
\(=0+0-145\)
\(=-145\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 13 − 135 + 49 ) − ( 13 + 49 ) = 13 − 135 + 49 − 13 − 49 = ( 13 − 13 ) + ( 49 − 49 ) − 135 = 0 + 0 − 135 = − 135.
![](https://rs.olm.vn/images/avt/0.png?1311)
( 13 - 135 + 49 ) - ( 13 + 49 )
= 13 - 135 + 49 - 13 - 49
= ( 13 -13 ) + ( 49 - 49 ) - 135
= 0 + 0 - 135
= -135
( 13 - 135 + 49 ) - ( 13 + 49 )
= 13 - 135 + 49 - 13 - 49
= ( 13 -13 ) + ( 49 - 49 ) - 135
= 0 + 0 - 135
= -135
![](https://rs.olm.vn/images/avt/0.png?1311)
(13 – 135 + 49) – (13 + 49) = 13 – 135 + 49 – 13 – 49
= (13 – 13) + (49 – 49) -135 = 0 + 0 – 135
= -135
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 13 + 49) - ( 13 - 135 + 49)
= 13 + 49 - 13 + 135 - 49
= ( 13 - 13) + ( 49 - 49) + 135
= 0 + 0 + 135
= 135
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left|-34\right|+(-4)\cdot(-1)^{2008}+(17-19)^2\)
\(=34+4+(-2)^2\)
\(=34+4+4\)
\(=42\)
\((-31)\cdot81-18\cdot31-31\)
\(=31\cdot(-81)-18\cdot31-31\)
\(=31\cdot(-81)-18-1\)
\(=31\cdot(-100)=-3100\)
\(=13-135+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-135\)
\(=0+0-135\)
\(=-135\)
Bài làm
( 13 - 135 + 49 ) - ( 13 + 49 )
= 13 - 135 + 49 - 13 - 49
= ( 13 - 13 ) + ( 49 - 49 ) - 135
= 0 + 0 - 135
= -135
# Học tốt #