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Rut gon :
2x -6/8-6/56-6/140-6/260=43/52
2x-12/13 =43/52
2x =43/52+12/13
x = 7/4 : 2
x = 7/8
Voi chạy trong
30 - 15 + 56 + 41 - 52 = 60 giây
Ngựa chạy trong
100 - 60= 40 (giây)
\(-3x-47-\left(-56\right)=-25\\ \Rightarrow-3x-47+56=-25\\ \Rightarrow-3x=-25+47-56\\ \Rightarrow-3x=-34\\ \Rightarrow x=\dfrac{-34}{-3}=\dfrac{34}{3}\)
Vậy \(x=\dfrac{34}{3}\)
\(2\left(x+56\right)\left(x-6\right)=3^{25}:3^{22}\)
\(\Rightarrow2\left(x+56\right)\left(x-6\right)=3^{25-22}\)
\(\Rightarrow2\left(x+56\right)\left(x-6\right)=3^3\)
\(\Rightarrow\left(x+56\right)\left(x-6\right)=\dfrac{27}{2}\)
\(\Rightarrow x^2-6x+56x-336=\dfrac{27}{2}\)
\(\Rightarrow x^2+50x-336=\dfrac{27}{2}\)
\(\Rightarrow x^2+50x+625-961=\dfrac{27}{2}\)
\(\Rightarrow\left(x+25\right)^2=\dfrac{27}{2}+961\)
\(\Rightarrow\left(x+25\right)^2=\dfrac{1949}{2}\)
\(\Rightarrow\left[{}\begin{matrix}x+25=\sqrt{\dfrac{1949}{2}}\\x+25=-\sqrt{\dfrac{1949}{2}}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\sqrt{\dfrac{1949}{2}}-25\\x=-\sqrt{\dfrac{1949}{2}}-25\end{matrix}\right.\)
25+52+56+545=678
ủng hộ tớ nhé
25 + 52 + 56 + 545
= 77 + 56 + 545
= 133 + 545
= 678
Dress : 678
Answer : 678