8.a) 45
b) 225:5
c) S= (5+225)×45:2=5175
6.a) a*(b+c)= 145* 100= 14500
b)2a*(b+c) = 145*2*100= 29000
c) a*(5b+5c) =145*5*100= 72500
d) 3a+b+c= 3*45+100= 435+100= 535
e) 3a+2b+2c = 3*145+2*100=635
f)ab+ac= 145*100= 14500
5. 1pachet=24cutii
1cutie=12creioane
45504:12= 3792 cutii
3692:24 = 158 pachete
9. a:b=5, rest7 => a=b*5+7
a-b=67
b*5+7-b=67 => b=15
a-15=67 => a=82
calculati:
a) 5
b) 1
c) 7
