5) singurul nr par care este prim este 2
volum=latura³
volum=2³=8
6) (a+a+1+a+2)/3=(3a+3)/3=a+1=10
=>a=9
a+1=10
a+2=11
volum=lungime*latura*inaltime=
=9*10*11=99*10=990
6.
c)1954,43+678=2632,43
d)8139+429,632=8568,632
7.
c)346-287,52=58,48
d)5098-280,605=4817,395
8.
d)9026-(4831,78-1732,62)=
=9026-3099,16=5926,84