Question

Answer 1

a: \(-25-40=-\left(25+40\right)=-65\)

b: \(-35-\left(-40\right)=-35+40=40-35=5\)

c: \(7\cdot\left(-5\right)+4=-35+4=-31\)

d: \(27-3\cdot\left(-4-1\right)\)

\(=27-3\cdot\left(-5\right)\)

\(=27+15=42\)

e: \(24\cdot\left(-3\right)+24\cdot2+24\)

\(=24\left(-3+2+1\right)\)

\(=24\cdot0=0\)

f: \(35\left(-3\right)+35\cdot\left(-7\right)-35\cdot90\)

\(=35\left(-3-7-90\right)\)

\(=35\cdot\left(-100\right)=-3500\)