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\(x:\dfrac{6}{8}=\dfrac{15}{x}\)
\(\Leftrightarrow x^2=\dfrac{45}{4}\)
hay \(x\in\left\{\dfrac{3\sqrt{5}}{2};-\dfrac{3\sqrt{5}}{2}\right\}\)
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a. (x + 5) - 15 . 13 = 15
(x + 5) - 195 = 15
x + 5 = 15 + 195
x = 210 - 5
x = 205
b. 6(28 - 8x) = 72
28 - 8x = 72 : 6
8x = 28 - 12
x = 16 : 8
x = 2
( X + 5) - 15 . 13 = 15
( x + 5 ) - 195 = 15
x + 5 = 210
x = 205
6 ( 28 - 8x ) = 72
28 - 8x = 12
8x = 16
x = 2
Study well
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\(\frac{6}{8}=\frac{3}{4}\)
\(\Rightarrow\frac{3}{4}=\frac{15}{20}\)
\(\Rightarrow\frac{15}{x}=\frac{15}{20}\)
\(\Rightarrow x=20\)
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Ta có \(\frac{6}{8}=\frac{15}{x}\Rightarrow\frac{3}{4}=\frac{15}{x}\) => 3.x = 4.15 = 60 => x = 20
Dấu chấm là dấu nhân
\(\frac{6}{8}=\frac{15}{x}\)
\(\Rightarrow6x=15\cdot8\)
\(\Rightarrow6x=120\)
\(\Rightarrow x=20\)
Vậy x = 20
\(\frac{6}{8}=\frac{15}{x}\)
\(\Rightarrow\frac{60}{80}=\frac{60}{4x}\)
\(\Rightarrow80=4x\)
\(\Rightarrow x=20\)
Vậy x=20