Question

 cau 1 ;x+5 /48 = 7/42

 

cau 2 ; 125125125 /175175175 = 5/a tim a

Answer 1

\(\frac{x+5}{48}=\frac{7}{42}\Leftrightarrow\left(x+5\right).42=48.7\Rightarrow x+5=\frac{48.7}{42}=\frac{336}{42}=8\Rightarrow x=3\)

Answer 2

Câu 2: ta có 125125125/175175175 rút gọn còn 125/175

125 chia5=25

=>x=175 :25=7

Vậy x=7