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a, (-8)-(-12-8)=(-8)+12+8= [(-8)+8}]+12= 0+12=12
b, 1765-(312+1765)= 1765-312-1765=(1765-1765)-312=0-312=-312
c. (31-12)-(46+31-12)= 31-12+46-31+12= (31-31)+(12-12)+46=0+0+46=46
d, (5674-97)-5674=5674-97-5674=(5674-5674)-97=0-97=-97
e, (-1075)-(29-1075)=(-1075)+29+1075=[(-1075)+1075]+29=0+29=29
g, (18+29)+(158-18-29)=18+29+158-18-29=(18-18)+(29-29)+158=0+0+158=158
h, (13-135+49)-(13+49)=13-135+49-13-49=(13-13)+(49-49)-135=0+0-149=0-149=-149
a)(18+29)+(158-18-29) b)(13-13)+(49-49)-135
=47 +(140 - 29) =0 + 0 -135
=47 + 111 = 0 -135
=158 =-135
c)-9+(-11)+21+(-1)
=-2 + 20
=18
a. |-29|+(-11) = 29+(-11) = (29-11) = 18
b. 15 + 23 + (-25) + (-23) = [15+(-25)] + [23+(-23)]
= -10 + 0 = -10
d.
a, (18+29) + (158-18-29) = 18+29+158-18-29
= (18-18) + (29-29) + 158
= 0 +0 +158 = 158
b, (13-135+49) - (13+49) = 13-135+49 - 13-49
= (13-13) + (49-49) -135
= 0 +0 -135 = -135
e.\(\frac{2}{3};\frac{2}{5};\frac{3}{2};\frac{3}{5};\frac{5}{2};\frac{5}{3}\)
a, |-29|+(-11)=29+(-11)=18
b,15+23+(-25)+(-23)=38+(-25)+(-28)=13+(-23)=-10
d,
a, (18+29)+(158-18-29) b,(13-135+49)-(13+49)
= 18 +29+158-18-29 = 13-135+49-13-49
=47+158 -18-29 = -122+49-13-49
= 205-18-29 = -73-13-49
=158 = -135
e,2/3 ; 2/5 ; 3/2 ; 3/5 ; 5/3 ; 5/2
\(a,\left(13+49\right)-\left(13-135\right)\)
= \(13+49-13+135\)
= \(13-13+49+135\)
= \(184\)
\(b,\left(18+29\right)+\left(158-18-29\right)\)
= \(18+29+158-18-29\)
= \(158\)
\(c,4.5^2-3.\left(24-9\right)\)
= \(4.25-\left(72-27\right)\)
= \(100.-45\)
= \(55\)
\(d,\left[93-\left(20-7\right)\right]:16\)
= \(\frac{93-20+7}{16}\)
= \(\frac{80}{16}\)
= \(5\)
Bài 1:
5; (-23) + 105
= 105 - 23
= 82
6; 78 + (-123)
= 78 - 123
= - (123 - 78)
= - 45
bài1
1)2763 + 152 = 2915
2)-7 +(-14)
=-(14 +7)
=-21
b. 7 + (-12 + 43) - [2 + (19 - 34)]
= 7+31- [2+(-15)]
= 7+31-(-13)
= 51
a,(18+29)+(158-18-29)=18+29+158-18-29=158
b,(-13-135+49)-(13+49)=-13-135+49-13-49=-26-135=-161
c,(-25)+15=-10
d,(-99)+(-100)+(-101)+(-102)=-99-100-101-102=-402
e,34+(-11)+(-4)=34-4-11=19
f,134+45+(-14)+(-5)=(134-14)+(45-5)=120+40=160
g,21+(-50)+(-1)=(21-1)-50=20-50=-30
h,44+(-213)+/-156/=44+213+156=(44+156)+213=200+213=413
i,212+[37+(-312)+(-17)]=212+37-312-17=(212-312)+(37-17)=-100+20=-80