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`#\text{Namnvd_}`
`a)`
`159 - 524 - (59 - 424)`
`= 159 - 524 - 59 + 424`
`= (159 - 59) - (524 - 424)`
`= 100 - 100`
`= 0`
`c)`
`334 - (117 + 234) + (42 + 117)`
`= 334 - 117 - 234 + 42 + 117`
`= (334 - 234) - (117 - 117) + 42`
`= 100 + 42`
`= 142`
`e)`
`(13 - 135 + 49) - (13 + 49)`
`= 13 - 135 + 49 - 13 - 49`
`= (13 - 13) - (49 - 49) -135`
`= -135`
`g)`
`(239 - 178) - (239 + 522)`
`= 239 - 178 - 239 - 522`
`= (239 - 239) - (178 + 522)`
`= 700`
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i) (345 - 61 + 84) - (-61 + 116 + 345)
= 345 - 61 + 84 + 61 - 116 - 345
= (345 - 345) + (-61 + 61) + 84 - 116
= 0 + 0 - 32
l) -(711 - 53) + (711 - 153)
= -711 + 53 + 711 - 153
= (-711 + 711) + (53 - 153)
= 0 - 100
= -100
b) (36 + 79) + (145 - 79 - 36)
= 36 + 79 + 145 - 79 - 36
= (36 - 36) + (79 - 79) + 145
= 0 + 0 + 145
= 145
d) 271 - [(-43) + 271 - (-17)]
= 271 + 43 - 271 - 17
= (271 - 271) + 43 - 17
= 0 + 26
= 27
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(107-49)-(-107+49-54)
=107-49+107-49+54
=58+58+54
=116+54
=170
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25-(15-19+13)+(12-18+10)
= 25-15+19-13+12-18+10
=20
b)(53-76)-[-76-(-53)]
=53-76+76+53
=106
![](https://rs.olm.vn/images/avt/0.png?1311)
365-(120+80-365-350)
=365-120-80+365+350 =(365+365)-(120+80)+350 =730-200+350 =530+350 =880![](https://rs.olm.vn/images/avt/0.png?1311)
$A = (a + b) - (a + b) + (a - c) - (a + c)$
$A=a+b-a-b+a-c-a-c$
$A=-2c$
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( 123-27) +( 27+13-123)
= 123-27+27+27+13-123
= 123+13-123
= 13
b) (2020 -119 + 29) -(-119+29)
=2020-119+29+119-29
=2020+(119-119)+(29-29)
=2020
a) (123 - 27) +(27 + 13 - 123 )
= 123 - 27 +27 + 13 - 123
= 123- 123 -27 +27 +13
= 13
b)( 2020 - 119 +29 ) - (-119 +29 )
=2020 - 119 + 29 + 119 -29
= 2020 -119 + 119 + 29 - 29
=2020
f) (24 - 234) + (234 - 24 - 77)
= 24 - 234 + 234 - 24 - 77
= (24 - 24) + (-234 + 234) - 77
= 0 + 0 - 77
= -77
h) (73 - 651) - (192 - 551) + (27 - 108)
= 73 - 651 - 192 + 551 + 27 - 108
= (73 + 27) + (-651 + 551) + (-192 - 108)
= 100 - 100 - 300
= -300
k) 1935 - (46 + 1935) + 16
= 1935 - 46 - 1935 + 16
= (1935 - 1935) + (-46 + 16)
= 0 - 30
= -30