Question

va rog ajutatima chiar trebuie

Answer 1

2) -2x+5=-1
-2x=-1-5
-2x=-6      inmultim -1
x=6/2
x=3

3) c₁=75⁰
c₂=?
c₁+c₂=90⁰
c₂=90⁰-c₁
c₂=90-75
c₂=15⁰

4) 45⁰

5)  12=2²x3
42=2x3x7
(12,42)=2x3=6

6) 48=2⁴x3
120=2³x3x5
[48,120]=2⁴x3x5=240

7) din cate kg de preune se obtine 4 kg de gem?
9:5=1,8 kg
pt 12kg gem cate kg prune se folosesc?
12kgx1,8=21,6 kg

8) P=36cm
P=3·l ⇒ l=P/3=36/3=12
l=12cm