1. 800×[100-(26×2+2)]=
= 800×[100-(52+2)
= 800×(100-54)
= 800×46
= 36.800
2. 256×15-[(7000-723×4-8):100)]=
= 3840-[(7000-2892-8):100]
= 3840-(4100:100)
= 3840-41
= 3799
3. 60×395-30×[1019-19×(5+3×3)]=
= 23.700-30×[1019-19×(5+9)]
= 23.700-30×(1019-19×14)]
= 23.700-30×(1019-266)
= 23.700-30×753
= 23.700-22.590
= 1110
