Question

x=14 a+b=afla cât este in fiecare caz
a)7•a+7•b+7•x=700
b)39•a+39•b-39•x=3900

Answer 1

Răspuns:

a)7•a+7•b+7•x=700

x=14

7(a+b+x)=700

7(a+b+14)=700

a+b+14=700:7

a+b=100-14

a+b=86

b)39•a+39•b-39•x=3900

x=14

39(a+b-x)=3900

a+b-14=3900:39

a+b=100+14

a+b=114