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![](https://rs.olm.vn/images/avt/0.png?1311)
![](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)
(-123)+77+(-257)+23-43
=(-46)+(-257)+23-43
=(-303)+23-43
=(-280)-43
(-323)
kết quả phép tình trên bằng -323 nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
B=-123+77+(-257)+23-43
=-123+77-257+23-43
=-46-257+23-43
=-303+23-43
=-280-43
=-323
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(-123\right)+77+\left(-257\right)+23-43=\left(-123+23\right)+\left(77-257\right)-43=-100-180-43=-323\)
(−123)+77+(−257)+23−43
=(−123+23)+(77−257)−43
=−100−180−43
=−323
![](https://rs.olm.vn/images/avt/0.png?1311)
Chọn A
− 123 + 77 + − 257 + 23 − 43 = − 123 + 23 + − 257 − 43 + 77 = − 100 + − 300 + 77 = − 400 + 77 = − 323
![](https://rs.olm.vn/images/avt/0.png?1311)
− 123 + 77 + − 257 + 23 − 43 = − 123 + 23 + − 43 + − 257 + 77 = − 100 + − 300 + 77 = − 400 + 77 = − 323.
\(\left[\left(-457\right)+257\right]+\left[\left(-123\right)+123\right]\)
\(=\left(-200\right)+0=-200\)
\(\left(-457\right)+\left(-123\right)+123+257\)
\(=\left[\left(-123\right)+123\right]+\left[\left(-457\right)+257\right]\)
\(=0+\left(-200\right)=-200.\)