Question

Exercițiile 44,45,46,47. Ajutați-ma va rog!!!

Answer 1

44.    L+L+l+l=20
2L+2l=20 /:2
L+l=10

2L=3l => L=3l/2

3l/2+l=10. AMplificam cu 2
3l+2l=20
5l=20
l=20:5
l=4

L=3*4/2
L=12/2
L=6
                   45.224÷14=16 latimea primului dreptunghi
16×2=32 lungimea primului dreptunghi
16×3 =48 latimea al doilea dreptunghi
16×4=64 lungimea al doilea dreptunghi      46.5dam si 4 m=54m (lungimea)
                                                                    54m +6 m= 60 m lungimea dreptunghiului pe al carui perimetru se face ingradirea
32m +6 m= 38 m latimea dr pe care se face ingradirea
P= 60x2+38x2=120+76=196 m va fi lungimea gardului     47.l=latura scurta
                                                                                                  L=latura lunga
                                                                                                        P=2L+2l
                                                                                                              l=25
                                                                                                134=2L+2*25
                                                                                                  134=2L+50
                                                                                                     2L=134-50
                                                                                                         2L=84
                                                                                                        L=84/2
                                                                                                             L=42