Question

Dau coroana subiectul 1 si2

Answer 1

Subiectul 1

1.(-24):(-8)+(-2)^3=3+(-2)^3=-5^3=-125

2.triunghi echilateral

3.17 bile albe...33 bile roşii

17+33=50;50/17=0,34%=34%(probabilitate/nr cazuri probabile)

4.3/x=24/16 (folosind proprietatea mezilor şi extremilor,rezolvăm)

3/x=24/16;x=3*16/24;x=16/8;x=2

5. a/b=2/5 =>a/2=b/5=K => a=2K;b=5K

7*2K-2*5K/4*2K+3*5K =14K-10K/8K+15K =4K/23K =4/23

Subiectul 2

1. -2*(-3+x)=-14

-3+x=-14+2

-4x=-12

x=3