Question

Daca a x b=18 si c x a=10 calculeaza: a x (b + c):7 si a x (b - c):8

Answer 1

$a*b=18 \\\\ a*c=10 \\\\\\ a*(b+c):7= (a*b+a*c):7 \\\\ <=>(18+10):7=28:7\to \boxed{4} \\\\\\ a*(b-c):8=(a*b-a*c):8 \\\\ <=>(18-10):8=8:8 \to \boxed{1}$

Answer 2

a=2, b=9, c=5 2*(9+5):7=4 2*(9-5):8=1