Răspuns :
Produsul mezilor=produsul extremilor
7*99=11*x=> x=(7*99)/11=63
7*99=11*x=> x=(7*99)/11=63
Proportionalitate
7*99=x*11
x=[tex] \frac{7*99}{11} [/tex]
x=7*9=63
7*99=x*11
x=[tex] \frac{7*99}{11} [/tex]
x=7*9=63