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\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
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
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
1) 2155-(174+2155)+(-68+174)
=2155-174-2155-68+174
=2155-2155+174-174-68
=0+0-68
=-68
1) 2155 - (174 + 2155) + (-68 + 174)
= 2155 - 174 - 2155 - 68 + 174
= (2155 - 2155) + (-174 + 174) - 68
= 0 + 0 - 68
= -68
2) -25 . 72 + 25 . 21 - 49 . 25
= 25 . (-72) + 25 . 21 - 49 . 25
= 25 . (-72 + 21 - 25)
= 25 . (-76)
= -1900
3) 35 . (14 - 23) - 23 . (14 - 35)
= 35 . 14 - 35 . 23 - 23 . 14 + 23 . 35
= (35 . 14 - 23 . 14) + (-35 . 23 + 23 . 35)
= [14 . (35 - 23)] + 0
= 14 . 12
= 168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 - 98 + 674
= (8154 - 8154) + (-674 + 674) - 98
= 0 + 0 - 98
= -98
5) -25 . 21 + 25 . 72 + 49 . 25
= 25 . (-21) + 25 . 72 + 49 . 25
= 25 . (-21 + 72 + 49)
= 25 . 100
= 2500
6) 27 . (13 - 16) - 16 . (13 - 17)
= 27 . 13 - 27 . 16 - 16 . 13 + 16 . 17
= (27 . 13 - 16 . 13) + (-27 . 16 + 16 . 17)
= [13 . (27 - 16)] + [16 . (-27 + 17)]
= (13 . 11) + [16 . (-10)]
= 143 - 160
= -17
1) 2155-2155-(174-174)+-68=0+0+-68=-68
giờ mk ghi kq được ko
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1) \( 2155 – (174 + 2155) + (-68 + 174) = -68\) 2) \(-25 . 72 + 25 . 21 – 49 . 25=-2500\) 3) \(35.(14 –23) – 23.(14–35)=168\) 4) \(8154 – (674 + 8154) + (–98 + 674)=-98\) 5) \(25.21+25.72+49.25=2399\) 6) \(27.(13-16)-16.(13-27)=143\) 7) \(–1911 – (1234 – 1911) =-1234\) |