Question

Tính tổng :

a) \(\left(-24\right)+6+10+24\)

b) \(15+23+\left(-25\right)+\left(-23\right)\)

c) \(\left(-3\right)+\left(-350\right)+\left(-7\right)+350\)

d) \(\left(-9\right)+\left(-11\right)+21+\left(-1\right)\)

Answer 1

a) (-24) + 6 + 10 + 24

= [(-24) + 24] + 6 + 10

= 0 + 6 + 10

= 16

b) 15 + 23 + (-25) + (-23)

= [15+ (-25)] + [23 +(-23)]

= -10 + 0

= -10

c) (-3) + (-350) + (-7) + 350

=[-350 + 350] + [-3+(-7)]

= 0 + (-10)

= -10

d) (-9) + (-11) +21 + (-1)

= [ (-9) + (-11) ] + [ 21 + (-1)]

= -20 + 20

= 0

Answer 2

a) \(\left(-24\right)+6+10+24\)

\(=16\)

b) \(15+23+\left(-25\right)+\left(-23\right)\)

\(=-10\)

c) \(\left(-3\right)+\left(-350\right)+\left(-7\right)+350\)

\(=-10\)

d) \(\left(-9\right)+\left(-11\right)+21+\left(-1\right)\)

\(=0\)

Answer 3

\(a,\left(-24\right)+6+10+24\)

=\(\left[\left(-24\right)+24\right]+6+10\)

\(=0+16=16\)

b, \(15+23+\left(-25\right)+23\)

\(=\left[15+\left(-25\right)\right]+\left[\left(-23\right)+23\right]\)

\(=-10+0=-10\)

c, \(\left(-3\right)+\left(-350\right)+\left(-7\right)+350\)

\(=\left[\left(-3\right)+\left(-7\right)\right]+\left\{\left(-350\right)+350\right\}\)

\(=-10+0=-10\)

d, \(\left(-9\right)+\left(-11\right)+21+\left(-1\right)\)

\(=\left\{\left(-9\right)+\left(-11\right)\right\}+\left[21+\left(-1\right)\right]\)

\(=-20+20=0\)