Question

Answer 1

\(a,=\left(25+75\right)+19=119\\ b,=\left(25\cdot4\right)\cdot53=5300\\ c,=72\left(18+82\right)=7200\)

Answer 2

a)\(25+19+75=\left(25+75\right)+19=100+19=119\)

b)\(4\cdot53\cdot25=\left(4\cdot25\right)\cdot53=100\cdot53=5300\)

c)\(72\cdot18+72\cdot82=72\cdot\left(18+82\right)=72\cdot100=7200\)