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vă rog!!! ex 3,4
repede!


Vă Rog Ex 34 Repede class=

Răspuns :

3.
numere pare consecutive   2a  si 2a+2
2a(2a+2)=80
4a²+4a=80
a²+a=20
a(a+1)=4×5
a=4
l=2×4 =8m
L=2×4+2=10 m
P=2(8+10)=36 m

4.
x=mingi Dragos
8x=mingi Victor
(8x-12)/4=x+12
8x-12=4x+48
4x=60
x=15 mingi Dragos
8x=8×15=120 mingi Victor