Question

Va roog !!!! Urgeent!!!!!​

Answer 1

Răspuns:

15.

(x,42) i.p. (1/7,3)

x•1/7=42•3

x•1/7= 126

x=126×7

x=882

* /= linie de fractie

•= ori , semnul inmultirii ×

16.

(x,y,z)i.p.(3,6,9)

x•3=y•6=z•9= k

=> x=k/3

y=k/6

z=k/9

a) x+y+z=28

k/3+k/6+k/9=28 |•18

6k+3k+2k=504

11k=504

k=504/11

$x = \frac{ \frac{504}{11} }{3} = \frac{168}{11} \\ y = \frac{ \frac{504}{11} }{6} = \frac{84}{11} \\ z = \frac{ \frac{504}{11} }{9} = \frac{56}{11}$

b)x+y+z=42

k/3+k/6+k/9=42 |•18

6k+3k+2k=756

11k=756

k=756/11

$x = \frac{ \frac{756}{11} }{3} = \frac{252}{11} \\ y = \frac{ \frac{756}{11} }{6} = \frac{126}{11} \\ z = \frac{ \frac{756}{11} }{9} = \frac{84}{11}$

c)x+y+z=84

k/3+k/6+k/9=84 |•18

6k+3k+2k= 1512

11k=1512

k= 1512/11

$x = \frac{ \frac{1512}{11} }{3} = \frac{504}{11} \\ y = \frac{ \frac{1512}{11} }{6} = \frac{252}{11} \\ z = \frac{ \frac{1512}{11} }{9} = \frac{168}{11}$

* /= linie de fractie

• = ori , semnul inmultirii ×

Sper ca te-am ajutat :)