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a) (-125) + 100 + 80 + 125 + 20
= [(-125) + 125] + (80 + 20) + 100
= 0 + 100 + 100
= 200
b) 27 + 55 + (-17) + (-55)
= [27 + (-17)] + [55 + (-55)]
= (27 - 17) + 0
= 10
c) (-92) + (-251) + (-8) + 251
= [(-251) + 251] + [(-92) + (-8)]
= 0 - 100
= -100
d) (-31) + (-95) + 131 + (-5)
= [(-31) + 131) + [(-95) + (-5)]
= 100 + (-100)
= 0
Hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( -125) + 100 + 80 + 125 + 20
= [ ( -125)+125] + ( 80+20) + 100
= 0 + 100 + 100 = 200
b) 27 + 55 + (-17) + ( - 55)
= [ 27+(-17)] +[ 55+(-55)]
= 10 + 0 = 10
c) (-92) + (-251) + (-8) + 251
= [ (-92) + (-8)] + [ (-251)+251]
= (-100) + 0 = -100.
d) (-31) + (-95) +131 + (-5)
= [ (-31)+131] +[ (-95)+(-5)] = 100 + (-100) = 0
e) (187 - 23) - (20-180)
= 187 - 23 - 20 + 180 = (187-180) - (23-20) = 7 - 3 = 4
g) (-50+19+143) - (-79+25+48)
= -50+19+143 + 79 - 25 - 48
= [ -50-25] + (19 + 79) + 143 - 48
= -75 + 98 + 143 - 48 = 143 - 75 + ( 98 -48)
= 68 + 50 = 118
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( - 125 ) + 100 + 80 + 125 + 20
= ( - 125 + 125 ) + 100 + ( 80 + 20 )
= 0 + 100 + 100
= 200
b, 27 + 55 + ( - 17 ) + ( - 55 )
= ( 27 - 17 ) + ( 55 - 55 )
= 10 + 0
= 10
c, ( - 92 ) + ( - 251 ) + ( - 8 ) + 251
= ( - 92 - 8 ) + ( - 251 + 251 )
= - 100 + 0
= - 100
d, ( - 31 ) + ( - 95 ) + 131 + ( - 5 )
= ( - 31 + 131 ) + ( - 95 - 5 )
= 100 + ( - 100 )
= 0
a) (-125) + 100 + 80 + 125 + 20
= [(-125) + 125] + 100 + (80 + 20)
= 0 + 100 + 100
= 200
b) 27 + 55 + (-17) + (-55)
= [27 + (-17)] + [55 + (-55)]
= 10 + 0
= 10
c) (-92) + (-251) + (-8) + 251
= [(-92) + (-8)] + [(-251) + 251]
= (-100) + 0
= -100
d) (-31) + (-95) + 131 + (-5)
= [(-31) + 131] + [(-95) + (-5)]
= 100 + (-100)
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-125)+100+80+125+ 20=[(-125)+125]+100+(80+20)
=0+100+100=200
b)27+55+(-17)+(-55)=[27+(-17)]+[55+(-55)]
=10+0=10
c)(-92)+(-251)+(-8)+251=[(-92)+(-8)]+[(-251)+251]
=(-100)+0=-100
d)(-31)+(-95)+131+(-5)=[(-31)+131]+[(-95)+(-5)]
=100+(-100)=0
a) ( -125)+100+80+125+20
= [(-125) + 125] + (80+20) +100
= 0 + 100+100
=200
b) 27+55+(-17)+(-55)
= [27+(-17)]+[55+(-55)]
= 10+0
=10
c) (-92)+(-251)+(-8)+251
=[(-251)+251]+[(-92)+(-8)]
=0+(-100)
=-100
d) (-31)+(-95)+131+(-5)
=[(-31)+131]+[(-95)+(-5)]
=100+(-100)
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
câu 1:
-125+100+80+125-180
= (-125+125)+100+(80-180)
= 0+100-100
=0
câu 2:
27+55+(-17)-75
= (27-17)+(55-75)
= 10-20
=-10
Câu 3:
-92+( -253)-8+251
= (-92-8)+(-253+251)
= -100-2
= -102
Câu 4:
-351+(-95)+131-5
= (-351+131)+(-95-5)
= -220 - 100
=-320
![](https://rs.olm.vn/images/avt/0.png?1311)
A) 18 x ( 16 - 16 ) = 0
= 18 x 0
= 0
B) ( x -15) x 72 =0
( x -15) = 0:72
( x -15) = 0
x = 0+15
x = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
<=>3x= 251-125
<=>3x= 126
<=>x=42
125 + 3x = 251
3x = 251 - 125
3x = 126
x = 126 : 3
x = 42
nhớ k cho mình nhé