Question

Tính:

1. 25 + (-8) + (-25) + (-2)

2. (-23) + 13 + (-17) + 57

Answer 1

1. 25 + (-8) + (-25) + (-2)

= [ 25 + (-25) ] + [ (-8) + (-2) ]

= 0 + (-10)

= -10

2. (-23) + 13 + (-17) + 57

= [ (-23) + (-17) ] + ( 13 + 57 )

= (-40) + 70

= 30

Answer 2

25+(-8)+(-25)+(-2)=-10

-23+13+(-17)+57= 30

Answer 3

\(1.25+\left(-8\right)+\left(-25\right)+\left(-2\right)\)

\(=\left[25+\left(-25\right)\right]+\left[\left(-8\right)+\left(-2\right)\right]\)

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

\(=-10\)

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\(2.\left(-23\right)+13+\left(-17\right)+57\)

\(=\left(-23+13\right)+\left(-17+57\right)\)

\(=-10+40\)

\(=30\)