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![](https://rs.olm.vn/images/avt/0.png?1311)
a) x ∈ {-2;-1;;0;1;2;3}
b) x ∈ {10;11;12}
c) x ∈ {0;1;2;3;4;5}
d) x ∈ {-1;0;1;2}
![](https://rs.olm.vn/images/avt/0.png?1311)
a,(-15)-23+(-85)-77=[(-15)+(-85)]-(23+77)=(-100)-100=-200
b,(-24) + 4 + (-6) + 26 =[(-24)+(-6)]+(4+26)=(-30)+30=0
c, 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17 =(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80
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`@` `\text {Ans}`
`\downarrow`
`4.`
`a)`
\((-35) + 23 – (-35) – 47\)
`= (-35) + 23 + 35 - 47`
`= (-35 + 35) + (23 - 47)`
`= -24`
`b)`
\( 24 – (-136) – (-70) + 15 + (-115)\)
`= 24 + 136 + 70 + 15 - 115`
`= (24+136) + 70 + (-115 + 15)`
`= 160 + 70 - 100`
`= 160 - 30`
`= 130`
`c)`
\(37 – (-43) + (-85) – (-30) + 15\)
`= 37 + 43 - 85 + 30 + 15`
`= (37+43) + 30 - (85 - 15)`
`= 80 + 30 - 70`
`= 110 - 70`
`= 40`
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 996 + 45 b) 37 + 198
= (996 + 4) + 41 = 35 + (2 + 198)
= 1000 + 41 = 35 + 200
= 1041 = 235
\(a,996+45\)
\(=\left(996+4\right)+41\)
\(=1000+41\)
\(=1041\)
\(b,37+198\)
\(=\left(198+2\right)+35\)
\(=200+35\)
\(=235\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(996+45=996+4+41=1000+41=1041\)
b, \(37+198=2+35+198=200+35=235\)
a) 996 + 45 b) 37 + 198
=996+41+4 =2+35+198
=(996+4)+41 =(2+198)+35
=1000+41 =100+35
=1041 =135
![](https://rs.olm.vn/images/avt/0.png?1311)
`a)79+65 = 79 + (21+44)=(79+21)+44=100+44=144`
`b) 996 + 45 = 996+(41+4)=(996+4)+41=1000+41=1041`
`c) 37 + 198 = (35+2)+198=35+(2+198)=35+200 = 235`
`c) 3492 + 319 = 3492+(311+8)=(3492+8)+311=3500+311=3811`
a) 79+65=(79+21)+44=100+44=144
b) 996+45=(996+4)+41=1000+41=1041
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow\left[\left(-37\right)+129\right]-\left[529-117\right]\)
\(\Rightarrow92-412\)
\(\Rightarrow-320\)
b,-146+|-37|-(37-146)= -146 + 37 - 37+ 146
= (-146+146)+(37-37)
=0