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1. -25.72 + 25.21 - 49.25
= 25.(-72) + 25.21 - 49.25
= 25.(-72 + 21 - 49)
= 25. (-100)
= -2500
2. 35(14 - 23) - 23(14 - 35)
= 35. (-9) - 23. (-9)
= -9(35 - 23)
= -9. 12
= -108
3. 8154 -(674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 + (-98) + 674
= 8154 - 8154 - 674 + 674 + (-98)
= -98
4. 25.21 + 25.72 + 49.25
= 25(21 + 72 + 49)
= 25. 142
= 3550
5. 27(13 - 16) - 16(13 - 27)
= (27.13 - 27.16) - (16.13 - 16.27)
= 27.13 - 27.16 - 16.13 - 16.27
= 27.13 - 16.13 - 27.16 - 16.27
= 27.13 - 16.13
= 13(27 - 16)
= 13.11
= 143
6. -1911 -(1234 - 1911)
= -1911 - 1234 + 1911
= -1911 + 1911 - 1234
= -1234
![](https://rs.olm.vn/images/avt/0.png?1311)
1, 27.(13-16)-16.(13-27)=27.(-3)-16(-14)=-81-(-224)=143
2 -1911-(1234-1911)=-1911-1234+1911=-1234
3 32.(-39)+16.(-22)=16.2(-39)+16(-22)=16(-78)+16(-22)=16[(-78)+(-22)]=16.(-100)=-1600
4 -(567-1945)-1945=-567+1945-1945=-567
5 44.(-36)+22.(-28)=22.2(-36)+22(-28)=22(-72)+22(-28)=22[(-72)+(-28)]=22.(-100)=-2200
k mình nhé
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1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 2155-(174+2155)+(-68+174)
=2155-174-2155-68+174
=2155-2155+174-174-68
=0+0-68
=-68
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
a) 27(13-16) -16(13-27)
= 27.(-3) -16.(-14)
= (-81) -(-224)
= -81 + 244
= 143
b) -25.21+25.72+49.25
= -525 + 1800+ 1225
= 1275 + 1225
= 2500
c) -1911-(1234-1911)
= -1991 - (-677)
= -1991 + 677
= -1234
d) -1945-(567-1945)
= -1945 - (-1378)
= -1945 + 1378
= 567