[Toán 6] Tổng hợp

K

kakashi_hatake

[TEX]\frac{a}{b}=\frac{3}{5} \Rightarrow 5a=3b [/TEX]
Mà (a,b)=30 \Rightarrow a=30k, b=30q, (k,q)=1 mà [TEX]5k=3q \Rightarrow k=3, q=5[/TEX]
Vậy a=90, b=150
 
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