Question

32. Daca a/b=21, atunci

a) 5a/b= ?

b) (a+b) /b= ?

c) (a-b) /b= ?

d) (7a+3b) /b= ?

Answer 1

a) $\frac{5a}{b}=5\times\frac{a}{b}=5\times21=105$

b) $\frac{a+b}{b}=\frac{a}{b}+\frac{b}{b}=21+1=22$

c) $\frac{a-b}{b}=\frac{a}{b}-\frac{b}{b}=21-1=20$

d) $\frac{7a+3b}{b}=\frac{7a}{b}+\frac{3b}{b}=7\times 21+3=147+3=150$