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a) (–37 ) + (–112)
= –(37 + 112) (cộng hai số nguyên âm).
= –149.
b) (–42) + 52
= 52 – 42 (cộng hai số nguyên khác dấu)
= 10
c) 13 – 31 = –31 + 13 = – (31 – 13) = –18.
d) 14 – 24 – 12 = 14 – (24 + 12) = 14 – 36 = – (36 – 14) = –22.
e) (–25) + 30 – 15 = 30 – 25 – 15 = 30 – (25 + 15) = 30 – 40 = –10
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(\left(-37\right)+\left(-112\right)=-149\)
b. \(\left(-42\right)+52=10\)
c. \(13-31=-18\)
d. \(14-24-12=-22\)
e. \(\left(-25\right)+30-15=-10\)
a. (−37)+(−112)=−149(−37)+(−112)=−149
b. (−42)+52=10(−42)+52=10
c. 13−31=−1813−31=−18
d. 14−24−12=−2214−24−12=−22
e. (−25)+30−15=−10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-37) + (-112) = -149
b) (-42) + 52 = 10
c) 13 - 31 = -18
d) 14 - 24 -12 = -22
e) (-25) + 30 - 15 = -10
a) ( - 37 ) + ( - 112 ) = - 149
b ) ( - 42 ) + 52 = 10
c) 13 - 31 = -18
d) 14 - 24 - 12 = - 22
e) ( - 25 ) + 30 - 15 = - 20
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`1,`
`a)`
`-7/25 + (-8)/25`
`= (-7 - 8)/25`
`= -15/25`
`= -3/5`
`b)`
`6/13 + (-15)/39`
`= 18/39 + (-15)/39`
`= (18 - 15)/39`
`= 3/39`
`= 1/13`
`c)`
`5/7 + 4/(-14)`
`= 10/14 + (-4)/14`
`= (10 - 4)/14`
`= 6/14`
`= 3/7`
`d)`
`-8/18 + (-15)/27`
`= -4/9 + (-5)/9`
`= (-4-5)/9`
`= -9/9 = -1`
`2,`
`a)`
`3/5 + (-7)/4`
`= 12/20 + (-35)/20`
`= (12 - 35)/20`
`=-23/20`
`b)`
`(-2) + (-5)/8`
`= (-16)/8 + (-5)/8`
`= (-16 - 5)/8`
`= -21/8`
`c)`
`1/8 + (-5)/9`
`= 9/72 + (-40)/72`
`= (9-40)/72`
`= -31/72`
`d)`
`6/13 + (-14)/39`
`= 18/39 + (-14)/39`
`= (18 - 14)/39`
`= 4/39`
`e)`
`(-18)/24 + 15/21`
`= (-3)/4 + 5/7`
`= (-21)/28 + 20/28`
`= (-21 + 20)/28`
`= -1/28`
A) -149
B) 10
C) -18
D) -22
E) -10