1)
524*28+15*24-16*24*12=
14672+360-384x12=
14672+360-4608=
=15032-4508=
=10524
862+152*13+16*(248-13*11)=
862+152x13+16x(248-143)=
862+152x13+16x105=
862+1976+1680=
=4518
2)
100x24=2400
3)
243x15=3645
624+3645=4269
124x10=1240
4269-1240=3029
3029+83=3112