2)102·15=1530
3)3636:9=404
4)9/7-3/7+1/7=7/7=1
5)1,(6):5+0,(6)=16-1/9:5+6/9=15/9·1/5+6/9=3/9+6/9=9/9=1(regula mezilor si a persilor)
6)N=25% din 200
pret final=x-25x/100=200-25·200/100=200-50=150 lei
7)0
8)Nr 12x ∈D2 (ultimele cifre ale divizibilitatii lui 2 sunt cifre pare)
x={0,2,4,6,8}
9)4,72=472/100
10)13/3=4,(3)
11)ma=(a+b)/2=(2,15+5,85)/2=8/2=4
12)1000m²=10dam²
13)P=(L+l)·2=(4m+5dm)·2=(4m+0,5m)·2=4,5·2=9m
14)A=l²=36cm²
l=√36=6cm
15)5^0+2^1+3^2=1+2+9=12
16)1234-987=247
17)Pp=100cm
lp=Ldreptunghi=100:4=25cm
ldreptunghi=25:2=12,5cm
Pdreptunghi=(25+12,5)·2=37,5·2=75cm
