Răspuns:
22, (5x+7y)/(9x-5y) Dai si la numitor si la numarator , factor commun fortat pe y
y(5*x/y+7)/y(9*x/y-5)= simplif ici prin y=
(5*x/y+7)/(9*x/y-5)= inocuiesti pe x/y cu 3/5=
(5*3/5+7)/(9*3/5-5)=
(15/5+7)/(27/5-5)= aduci la acelasi numitor=
(15+5*7)/5:(27-5*5)/5=
(15+35)/5:(27-25)/5=50/5*5/2=50/2=25
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23.DAi factor comun fortat pe y
y(4*x/y+5)/y(5*x/y+4)=
(4x/y+5)/(5*x/y+4)= inlocuiesti pe x/y cu 2/3
(4*2/3+5)/(5*2/3+4)=
(8/3+5)/(10/3+4)= aduci la acelasi numitor=
(8/3+3*5/3)/(10/3+3*4/3)=
(8/3+15/3)/(10/3+12/3)=
23/3:22/3=
23/3*3/22=23/22
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24
(4x+9)/(5y+6)=3/2
2*(4x+9)=3(5y+6)
8x+18=15y+18
8x=15y
x/y=15/8
Explicație pas cu pas:
