\(a,\left(-24\right)+6+10+24\)
\(=\left(-24+24\right)+6+10\)
\(=0+6+10\)
\(=16\)
\(b,15+23+\left(-25\right)+\left(-23\right)\)
\(=\left(15-25\right)+\left(23-23\right)\)
\(=-10+0\)
\(=-10\)
\(c,\left(-3\right)+\left(-350\right)+\left(-7\right)+350\)
\(=\left(-3-7\right)+\left(-350+350\right)\)
\(=-10+0\)
\(=-10\)
\(d,\left(-9\right)+\left(-11\right)+21+\left(-1\right)\)
\(=\left(-9-1\right)+\left(-11+21\right)\)
\(=-10+10\)
\(=0\)
Bài 1: Tính tổng
a) ( - 24 ) + 6 + 10 + 24
= [ ( - 24 ) + 24 ] + 16 = 0 + 16 = 16
b) 15 + 23 + ( - 25 ) + ( - 23 )
= [ 25 + ( - 25 ) ] + [ ( - 23 ) + 23 ]
= 0 + 0 = 0
c) ( - 3 ) + ( - 350 ) + ( - 7 ) + 350
= [ 350 + ( - 350 ) ] + [ ( - 3 ) + ( - 7 ) ]
= 0 + ( - 10 ) = - 10
d) ( - 9 ) + ( - 11 ) + 21 + ( - 1 )
= [ ( - 9 ) + ( - 1 ) ] + [ 21 + ( - 11 ) ]
= ( - 10 ) + 10 = 0
