Question

tìm số tự nhiên x và y biết 3/x=y/8=15/20

Answer 1

Do 3/x=y/8=15/20(=3/4) 
<=> 3/x=3/4 <=> 3x=12 <=> x=4 và y/8=3/4 <=> 4y=24 <=> y=6 
Vậy x=4;y=6 

Answer 2

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