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Tìm a, b thuộc N biết a/b=4/5 và BCNN(a,b)=140

Tìm a,b \(\in\)N biết :

a/b = 4/5 và BCNN(a,b) = 140

Help me!!

Theo dõi Vi phạm
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Trả lời (1)

 
 
 
  • Gọi \(ƯCLN\left(a,b\right)=d\Rightarrow\left\{{}\begin{matrix}a=d.a_1\\b=d.b_1\\ƯCLN\left(a_1;b_1\right)=1\end{matrix}\right.\)

    \(\Rightarrow BCNN\left(a,b\right)=d.a_1.b_1=140\)\(\left(1\right)\)

    \(\dfrac{a}{b}=\dfrac{4}{5}\Rightarrow\dfrac{d.a_1}{d.b_1}=\dfrac{4}{5}\Rightarrow\dfrac{a_1}{b_1}=\dfrac{4}{5}\) \(\Rightarrow\left[{}\begin{matrix}a_1=4\\b_1=5\end{matrix}\right.\) (do \(ƯCLN\left(a_1,b_1\right)=1\))\(\left(2\right)\)

    Từ \(\left(1\right)+\left(2\right)\Rightarrow d.4.5=140\)

    \(\Rightarrow d=7\)

    \(\Rightarrow\left[{}\begin{matrix}a=7.4=28\\b=7.5=35\end{matrix}\right.\) (thỏa mãn)

    Vậy \(2\) số \(a,b\) cần tìm là \(28,35\)

    ~ Chúc bn học tốt ~

      bởi Đối Thủ Mạnh 15/12/2018
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    15/12/2018 |   1 Trả lời

 

YOMEDIA
1=>1