Răspuns :

a) xy+xz=x(y+z)=2(y+z)=10/:2..... → y+z=5........... b) z(x-y)=5*4=xz-yz=20........ c)y(x+z)=5(x+z)=20/:5..... 2x=4/:2........ x=z=2
Miky93id
a) xy +xz= 10

x(y+z)=10

2* (y+z)=10

y+z=5

b)x-y=4

xz- yz= z(x-y)  = 5*4=20

c)xy + yz=20

y( x+z)=20

5(x+z)=20

x+z=4

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