Question

1. Tính. a) (-34) + (-91) + (-26) + (-99) b) 125 + |-25| c) |-26| + |-34| d) |-82| + (-120) e) (-275) + |-115| f) (-34) + |-34|

Answer 1

a) \(\left(-34\right)+\left(-91\right)+\left(-26\right)+\left(-99\right)\)

\(=\left[\left(-34\right)+\left(-26\right)\right]+\left[\left(-91\right)+\left(-99\right)\right]\)

\(=\left(-60\right)+\left(-190\right)\)

\(=-250\)

b) \(125+\left|-25\right|\)

\(=125+25\)

\(=150\)

c) \(\left|-26\right|+\left|-34\right|\)

\(=26+34\)

\(=60\)

d) \(\left|-82\right|+\left(-120\right)\)

\(=82+\left(-120\right)\)

\(=-38\)

e) \(\left(-275\right)+\left|-115\right|\)

\(=\left(-275\right)+115\)

\(=-160\)

f) \(\left(-34\right)+\left|-34\right|\)

\(=\left(-34\right)+34\)

\(=0\)

Answer 2

\(\text{ a, (-34) + (-91) + (-26) + (-99)}\)

\(=\left[\text{(-34) + (-26) }\right]+\left[(-91) + (-99)\right]\)

\(=\left(-60\right)+\left(-190\right)\)

\(=-250\)

\(b,\text{ 125 + |-25| }\)

\(=125+25=150\)

\(\text{c, |-26| + |-34|}\)

\(=26+34=60\)

\(\text{d, |-82| + (-120) }\)

\(=82+\left(-120\right)=-38\)

\(\text{ e,(-275) + |-115|}\)

\(=\left(-275\right)+115=-160\)

\(\text{f,(-34) + |-34|}\)

\(=\left(-34\right)+34=0\)