Question

am nevoie cât mai repede! dau coroană ❤️​

Answer 1

Răspuns:

Explicație pas cu pas:

2

a=2√3 ⇒a²=12

b=3√2 ⇒b²=18 ⇒ Raspuns: A a<b

3

9/√3=9√3/3=3√3 Raspuns: C

4

x-y=9

x+y=5

...........

2x =14 ⇒x=7 Ras[puns :D

5

AB=√(x2-x1)²+(y2-y1)² A(1,3) B(4,7)

AB=√(4-1)²+(7-3)²=√3²+4²=√25=5 Raspuns C

6

P=4l=8 cm ⇒l=2cm ⇒D=l√2=2√2 cm Raspuns:A

7

l=2πr=6π ⇒r=3cm A=πr²=9π cm² Raspuns:C

8

Teorema inaltimii

AD²=BD·DC 12²=BD·9 ⇒BD=144/9=16 cm

BC=BD+DC=9+16=25cm

A=AD·BC/2=12·25/2=6·25=150 cm²

Raspuns B

9

AB/DE=AC/DF=10/5=14/DF=2 ⇒DF=14:2=7 cm

Raspuns: A