b: \(=7.5\cdot\left(2.5\cdot0.04\right)=7.5\cdot0.1=0.75\)
c: \(=73.5\left(35.64+64.36\right)=7350\)
d: \(=3.12\cdot\left(8\cdot1.25\right)=3.12\cdot10=31.2\)
e: \(=6.48\left(11.25-1.25\right)=6.48\cdot10=64.8\)
f: \(=58.35\left(3.67+6.33\right)=58.35\cdot10=583.5\)