457+123=
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left[\left(-457\right)+257\right]+\left[\left(-123\right)+123\right]\)
\(=\left(-200\right)+0=-200\)
\(\left(-457\right)+\left(-123\right)+123+257\)
\(=\left[\left(-123\right)+123\right]+\left[\left(-457\right)+257\right]\)
\(=0+\left(-200\right)=-200.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{-457+(-123)+23+27}\)
\(\text{= -457-123+23+27}\)
\(\text{= (-457+27) - (123-23)}\)
\(\text{= -430 - 100 = -530}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6=60935974
3.29+457-123=421 tick nha bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(\left(3965-2378\right)-\left(437-1378\right)-528\)
\(=3965-2378-437+1378-528\)
\(=\left(3965-437-528\right)-\left(2378-1378\right)\)
\(=3000-1000=2000\)
b: \(\left(-457\right)+\left(-123\right)+23+237\)
\(=\left(-457+237\right)+\left(-123+23\right)\)
\(=-220-100=-320\)
c: \(\left(-329\right)-\left(15-101\right)-\left(25-440\right)\)
\(=-329-15+101-25+440\)
\(=\left(440-15-25\right)+\left(-329+101\right)\)
\(=400-228=172\)
![](https://rs.olm.vn/images/avt/0.png?1311)
45 = 45
123 < 213
457 > 145
Tick mình nhé Sát thủ giấu tên
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)