a)=8+[13×3]-18
=8+39-18
=47-18
=29
b)=25+[150:2-5×(20-12)]
=25+[75-5×8]
=25+[70×8]
=25+560
=585
c)=2×[20×(9×4)]
=2×[20×26]
=2×520
=1040
d)=[132÷3+56÷2]×4
=[44+28]×4
=72×4
=288
e)=900-[62×(18÷9+40÷10)]:261
=900-[62×(2+10)]:261
=900-[62×20]:261
=900-1240:261
=900-4.75
=895.25
f)=127×[307-816÷4]-104
=127×[307-204]-104
=127×103-104
=13081-104
=12977
g)=103+[78×(20-18)]:2
=103+[78×2]:2
=103+156:2
=103+78
=25
h)=4207×[546×162:4]
=4207×[88452:4]
=4207×22113
=93029391
i)=90+[(100÷100)+10-25×4]
=90+[1+10-25×4]
=90+[11-100]
=990-100
=890
