$4,5\cdot \left(15,3-2\right)=4,5\cdot 13,3=59,85$

$0,5\cdot \left(0,8+7,6\right)=0,5\cdot 8,4=4,2$

$2,34+0,16\cdot 2,25-1,79=2,34+0,36-1,79=2,7-1,79=0,91$