Question

Doar exercitiul 3!! Va rog mult!

Answer 1

a) 2(x+2y)             14
__________  =  ______
        4y                   8

   x+2y       7
 _____ = ___
     2y        4

4x+8y=14y
4x=6y   => x/y=3/2

b)Produsul mezilor=produsul extremilor
63x=56y-49x
63x+49x=56y
112x=56y  =>y/x=112/56=2

c)32x+48y=26x+52y
32x-26x=52y-48y
6x=4y  =>x/y=4/6=2/3

d)170x+102y=116x+174y
170x-116x=174y-102y
54x=72y   => y/x=54/72=3/4

e)126x+36y=44x+77y
126x-44x=77y-36y
82x=41y  => x/y=41/82=1/2

Answer 2

a)2(x+2y)supra4=14supra8=x+2yspura2y=7supra4=4x+8y=14y,4x=6y de unde rezulta cax pe y =3 pe 2; b)63x=56y-49x=63x+49x=56=112x=56y de unde rezulta ca ysupra x=112/56=2 c)2x+3ysupra2x+3y=13 supra16de unde rezulta ca 32+48y=28+52y=32x-26x=52y-48y.6x=4y de unde rezulta ca x/y=4/6=2pe 3 d)170x+102y=116+174y=170x-116x=170y-102y=54x=72y de unde rezulta ca y supra x eate egal cu 54/72=3/4; e)126x+36y=44x+77y=126x-44x egal cu77y-36y de unde rezulta ca 82x-41y=x/y=41:82=1/2