Ta có : (-123) + 77 + (-257) + 23 - 43
= (-123 + 23) + (77 - 257) - 43
= -100 + 180 - 43
= 80 - 43
= 37
\(\left(-123\right)+77+\left(-257\right)+23-43\)
\(=\left(-123\right)+23+\left(-257\right)+77-43\)
\(=\left(-100\right)+\left(-180\right)-43\)
\(=\left(-280\right)-43=-323\)
(-123)+77+(-257)+23-43
=(-123+23)+(77-257)-43
=-100+180-43
=80-43
=37
(-123)+77+(-257) +23-43
= [ ( - 123 ) + 23 ] + [ ( - 257 ) + 77 ] +( - 43 )
= ( - 100 ) + ( - 180 ) + ( - 43 )
= - 323
=(-123+23)+(-257+77)-43.
=-100+(-180)-43
=-180-43.
=-223.
Mấy bn bị nhầm rồi sao!