Question

Am nevoie de rezolvările la 10, 11, 12, 13, rapid!!

Answer 1

10.
x/2+1,5y=2
-2x+y=6

2x+6y=8
-2x+y=6
 
6y+y=14
7y=14
y=2
x=(2-6)/2=-2

11.
deoarece DE este linie mijlocie  DE=BC /2
si inaltimea triunghiului DEF=AD/2
A(ΔDEF)=(BC/2×AD/2)/2=[BC×AD/2]/4=96/4=24 cm²
raspuns corect D)24 cm²

12.
x°+x°+10°+x°+20°+x°+30°=360°
4x°+60°=360°
4x°=300°
x°=75°
raspuns corect b)75°

13.
a)
cazuri favorabile 26
cazuri posibile 12+26+36=74
probabilitate =26/74=13/37

b) 12+26+10=48 bile