1. 56:c=7
c= 56:7=8
a=35*c
a=35*8
a=280
b=3640:a
b=3640:280=13
2. a+b+c=91
a:b=5r3
c=2b
a=5b+3
5b+3+b+2b=91
8b=91-3
8b=88:8
b=11
⇒a=5*11+3=58
⇒c= 2*11=22
3. a) [6x(6+6):6-6]:6=
(6x12:6-6):6=
(72:6-6):6=
6:6=1
b) 100:[(56x4-8x3):2-(86-8x6:2)+3x4=
100:[(224-24):2-(86-24)+12=
100:(200:2-62+12)=
100:(100-74)=100:26=3,84