1)-3+(-5)*(+3)
-3+-15=-18 =>A)
2)D12={1,2,3,4,6,12}=>12=>B)
3)triunghi echilateral
P=18dm
l=?
P=3*l=18=>l=6dm=>C)
4)x/y=2/3=k=>x=2k
y=3k
2x+y/x+2y=?
2*2k+3k/2k+2*3k=4k+3k/2k+6k=7k/8k=7/8=>B)
5)triunghi drept=>mediana e jumatate din ip deci 24*2=48=>D)
6)180-72=108=>D)
7)echipa 8 muncitorii......10 zile termina o lucrare
echipa 5 muncitorii.......x zile
8/5=10/x
x=80/5=16 zile=>A)
