a: \(-25+\left(-30\right)\)
\(=-25-30\)
\(=-\left(25+30\right)=-55\)
b: \(-70-\left(-35\right)\)
\(=-70+35\)
\(=-\left(70-35\right)=-35\)
c: \(48\cdot\left(-5\right)-25\)
\(=-48\cdot5-25\)
\(=-240-25=-265\)
d: \(32:\left(-8\right)+15\)
\(=-\dfrac{32}{8}+15\)
=-4+15
=11
e: \(24-3\cdot\left[25+5\cdot\left(3-8\right)\right]\)
\(=24-3\cdot\left[25+5\cdot\left(-5\right)\right]\)
\(=24-3\cdot\left[25-25\right]\)
\(=24-3\cdot0=24-0=24\)
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