5 a). 18x11+297:3=198+99=297
998:2+505:5=499+101=600
350-6x18:3= 350-6x6= 350-36=314
b). 175-175:5+25x15= 175-35+375=140+375=515
395+52:52x7= 395+1x7=395+7=402
600:10+270:9=60+30=90
c). 600:10:2+125:5-270:9= 60:2+25-30=30+25-30=55-30=25
300-123x4:6:1+88x4=
= 300-492:6:1+352
=300-82:1+352=
=300-82+352=
=218+352=
=570
1200+456x12-780:20x40:1=
=1200+5472-39x40=
=1200+5472-1560=
=6672-1560=
=5112
