Question

Tính:

a) (-9) + 10 + (-10) + (-45) + 55

b) 123 + |-25| + (-|25|) - (-23)

Answer 1

Giải:

a) \(\left(-9\right)+10+\left(-10\right)+\left(-45\right)+55\)

\(=-9+10-10-45+55\)

\(=-9+\left(10-10\right)+\left(-45+55\right)\)

\(=-9+10=1\)

b) \(123+\left|-25\right|+\left(-\left|25\right|\right)-\left(-23\right)\)

\(=123+25+\left(-25\right)+23\)

\(=123+25-25+23\)

\(=123+\left(25-25\right)+23\)

\(=123+23=146\)