Tính hợp lý nếu có thể
(-123)+77+(-257) +23-43
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\(\left(-123\right)+77+\left(-257\right)+23-43=\left(-123+23\right)+\left(77-257\right)-43=-100-180-43=-323\)
(−123)+77+(−257)+23−43
=(−123+23)+(77−257)−43
=−100−180−43
=−323
![](https://rs.olm.vn/images/avt/0.png?1311)
− 123 + 77 + − 257 + 23 − 43 = − 123 + 23 + − 43 + − 257 + 77 = − 100 + − 300 + 77 = − 400 + 77 = − 323.
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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)
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(-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)
M = (-123) + 77 + (-257) + 23 - 43
M = [(-123) + 23 ]+[(-257)+77]-43
M = -100 + (-170) - 43
M = -270 - 43
M = -313
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : (-123) + 77 + (-257) + 23 - 43
= (-123 + 23) + (77 - 257) - 43
= -100 + 180 - 43
= 80 - 43
= 37
\(\left(-123\right)+77+\left(-257\right)+23-43\)
\(=\left(-123\right)+23+\left(-257\right)+77-43\)
\(=\left(-100\right)+\left(-180\right)-43\)
\(=\left(-280\right)-43=-323\)