91:{910:[500-(115+51.5)]}
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258 + 385 - 158 - 115 + 91 + 9 + 100
= ( 258 - 158 ) + ( 385 - 115 ) + ( 91 + 9 ) + 100
= 100 + 270 + 100 + 100
= 100 x 3 + 270
= 300 + 270
= 570
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) \(\left(-34\right)+\left|-34\right|\)
\(=\left(-34\right)+34\)
\(=0\)
\(\text{ a, (-34) + (-91) + (-26) + (-99)}\)
\(=\left[\text{(-34) + (-26) }\right]+\left[(-91) + (-99)\right]\)
\(=\left(-60\right)+\left(-190\right)\)
\(=-250\)
\(b,\text{ 125 + |-25| }\)
\(=125+25=150\)
\(\text{c, |-26| + |-34|}\)
\(=26+34=60\)
\(\text{d, |-82| + (-120) }\)
\(=82+\left(-120\right)=-38\)
\(\text{ e,(-275) + |-115|}\)
\(=\left(-275\right)+115=-160\)
\(\text{f,(-34) + |-34|}\)
\(=\left(-34\right)+34=0\)
\(91:\left\{910:\left[500-\left(115+255\right)\right]\right\}\)
\(91:\left\{910:\left[500-370\right]\right\}\)
\(91:\left\{910:130\right\}\)
\(91:7\)
\(=13\)
12.5^4-7.5^4):5^3-(18.7-5.18):3