Question

Va rog ajutor am nevoie de ea pana la ora 3​

Answer 1

Răspuns:

a)(2x+4y)/4y=14/8

(x+2y)/2y=7/4 /×2

(x+2y)/y=7/2

x/y+2=7/2 =>x/y=7/2-2=3/2

x/y=3/2

b)7x/(8y-7x)=7/9 /:7

x/(8y-7x)=1/9 1/(8y/x-7)=1/9

8y/x-7=9 y/x=(9+7)/8=

16/8=2. y/x=2

c)(2x+3y)/(2x+4y)=13/16

(2x+3y):y/(2x+4y):y=13/16

(2x/y+3)/(2x/y+4)=13/16

16(2x/y+3)=26(x/y+2) /:2

16x/y+48=13x/y+26

3x/y=-22. x/y=-22/3

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