(Y + 320) :23 =174
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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) \(–1911 – (1234 – 1911) =-1234\) |
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
=174:{2[36+(16-23)]}
=174:{2[36+(-7)]}
=174:{2x29}
=174:58
=3
174:{2[36+(4^2-23)]}
=174:{2[36+(-7)]}
=174:{2.29}
=174:58
=3
\(174:\left\{2.\left[36+\left(4^2-23\right)\right]\right\}\)
\(=174:\left\{2.\left[36+\left(16-23\right)\right]\right\}\)
\(=174:\left\{2.\left[36+\left(-7\right)\right]\right\}\)
\(=174:\left\{2.29\right\}\)
\(=174:58\)
\(=3\)
\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
174 : {2.[36 + (44 - 23)]}
= 174 : {2.[36+(-7)]}
= 174 : {2. 29}
= 174 : 58
= 3
Ta có 174 : {2.[36 + (42 - 23)]}
= 174 : {2.[36 + (-7)]}
= 174 : (2 . 29)
= 174 : 58
= 3
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
y=174*23-320 =>y=3682
là sao