\(-2003+\left(-21+75+2003\right)\)
\(=\left(-2003\right)+\left(-21\right)+75+2003\)
\(=\left[\left(-2003\right)+2003\right]+\left(-21\right)+75\)
\(=0+\left(-21\right)+75\)
\(=\left(-21\right)+75\)
\(=54\)
-2003 + (-21 + 75 + 2003)
= -2003 + (-21) + 75 + 2003
= (-2003 + 2003) + (-21) + 75
= 0 + 54
= 54
Ta có : - 2003 + ( - 21 + 75 + 2003 )
= - 2003 + ( 54 + 2003 ) = - 2003 + ( 54 + 2003 )
= - 2003 + 2057 = ( - 2003 + 2003 ) + 54
= 54 = 0 + 54 = 54