Question

Ca rog ex: 8,9,10,11,12,13,14,15,16,17,18.

Answer 1

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