17. Rotunjire la sute de mii:
123792=100000
534218=500000
693504=700000
209875=200000
811789=800000
18. MDX=1510
XC=90
CCCXXIX=329
MCCLX=1260
MMMXX=3020
MCDXII=1412
19. 19=XIX
147=CXLVII
950=CML
2016=MMXVI
3572=MMMDLXXII
20. Fie meri-a si peri-b.
a= [tex]\frac{a+b}{2}[/tex]+4 (amplificare cu 2 si scapare de numitor)====>2a=a+b+8=>
=>a=b+8
b=12=>a=20
nr pomi=a+b=20+12=32
*Le-am facut pe toate,pana la urma*
