1. Calculati:
A)(100-75)-[20+(15-70)-(88-18+40)]
b)100-{30+[(88-54)-(400-380)]+60}
c)22-{22-[22-(40-22)+(88-22)-(88-40)]}
d)400-{[23-(123-100)]-59+(-259+100)+10}
e){1200-[800+(-1450+750)-(390+210)]}-400
f)1-{2+(3-4)-[6-(7-8)+(9-10)]-11}+12
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