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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) \(–1911 – (1234 – 1911) =-1234\) |
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1.
\(35\times\left(14-23\right)-23\times\left(14-35\right)\)
\(=35\times14-35\times23-23\times14+23\times35\)
\(=\left(23\times35-35\times23\right)+14\times\left(35-23\right)\)
\(=0+14\times12\)
\(=168\)
2.
\(27\times\left(13-16\right)-16\times\left(13-27\right)\)
\(=27\times13-27\times16-16\times13+16\times27\)
\(=13\times\left(27-16\right)+\left(27\times16-16\times27\right)\)
\(=13\times11+0\)
\(=143\)
3.
\(44\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times2\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times\left(-72\right)+22\times\left(-28\right)\)
\(=22\times\left[\left(-72\right)+\left(-28\right)\right]\)
\(=22\times\left(-100\right)\)
\(=-2200\)
Chúc bạn học tốt
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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+21-49)
=25.(-100)
=-2500
3) 35(14 - 23) - 23(14 - 35)
=35.(-9)-23.(-21)
=(-315)-(-483)
=168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154-674-8154-98+674
=(8154-8154) + (-674+674) - 98
=0+0-98
=-98
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 35.(14-23)-23.(14-35) = 35.14-35.23-23.14-23.35 =14.(35-23) -35.23 - 23.35 = 14.12 = 168
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\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
35( 14 - 23 ) - 23( 14 - 35 )
= 35 . 14 - 35 . 23 - 23 .14 - 23 . 35
= 35 . 14 - 23 . 14
= 12 . 14
= 168
35(14 - 23) - 23(14 - 35)
= 35 . 14 - 35 . 23 - 23 . 14 - 23 . 35
= 35 . 14 - 23 . 14 - (35 . 23 - 23 . 35)
= 35 . 14 - 23 . 14 - 0
= 35 . 14 - 23 . 14
= 14 . (35 - 23)
= 14 . 12
= 168