Question

calculati x știind ca xy-xz=28 y-z=7
dau coroana

Answer 1

Răspuns:

Explicație pas cu pas:

xy-xz=28

x*(y - z) = 28

x*7 = 28

x = 28 : 7 = 4

Answer 2

$\it y-z=7\ \ \ \ \ (*)\\ \\ xy-xz=28\Rightarrow x(y-z)=28\ \stackrel{(*)}{\Longrightarrow}\ x\cdot7=28\ \Rightarrow\ x=4$