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\(a.\) \(\frac{x}{3.15}\) \(=\) \(\frac{0.15}{7.2}\)
<=> \(x=\) \(\frac{0.15\cdot3.15}{7.2}\)
<=>\(x=0.065625\)
\(b.\) \(\frac{-2.6}{x-11}=\frac{-12}{42}\)
<=>\(x-11=\frac{-2.6\cdot-12}{42}\)
<=>\(x-11=0.742857142\)
<=>\(x=11.74285714\)
\(3\frac{4}{5}:2x=0,25:2\frac{2}{3}\)
\(\Leftrightarrow\frac{19}{5}:2x=0,25:\frac{8}{3}\)
\(\Leftrightarrow\frac{19}{5}:2x=0,25\cdot\frac{3}{8}\)
\(\Leftrightarrow\frac{19}{5}:2x=\frac{3}{32}\)
\(\Leftrightarrow2x=\frac{19}{5}:\frac{3}{32}=\frac{19}{5}\cdot\frac{32}{3}=\frac{608}{15}\)
\(\Leftrightarrow x=\frac{608}{15}:2=\frac{608}{30}=\frac{304}{15}\)
\(\frac{x}{3,15}=\frac{0,15}{7,2}\)
\(\Rightarrow7,2x=0,15\cdot3,15=0,4725\)
\(\Rightarrow x=0,4725:7,2=0,065625\)
\(\frac{x}{3,15}=\frac{0,15}{7,2}\)
=> x.7,2 = 3,15.0,15
=> x.7,2 = 0,4725
=> x = 0,4725 : 7,2
=> x = 0,065625
Vậy x = 0,065625
Trả lời nè bạn ưi !!!
x=(3,15.0,15): 7,2
x=\(\frac{21}{320}\)
Chúc thành công.
Có : \(\frac{x}{3,15}=\frac{0,15}{7,2}\Rightarrow x=\frac{0,15.3,15}{7,2}=\frac{21}{320}\)
\(2x\left(x-\frac{2}{3}\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x=0\\x-\frac{2}{3}=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x=\frac{2}{3}\end{cases}}}\)
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\left(37-x\right).7=\left(x+13\right).3\)
\(259-x7=x3+39\)
\(x7-x3=39-259\)
\(x4=-220\Leftrightarrow x=-55\)
a)\(\frac{x}{3,15}=\frac{0,15}{7,2}\)
\(\Rightarrow7,2x=3,15.0,15\)
\(7,2x=0,4725\)
x = 0,4725:7,2
x=0,065625
b) \(2x\left(x-\frac{2}{3}\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x=0\\x-\frac{2}{3}=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0:2=0\\x=0+\frac{2}{3}=\frac{2}{3}\end{cases}}\)
Vậy........................................
\(c)\frac{37-x}{x+13}=\frac{3}{7}\)
\(\Rightarrow\left(37-x\right)7=3\left(x+13\right)\)
259-7x=3x+39
-7x-3x=39-259
-10x=-220
x=-220:(-10)
x=22
\(\frac{-2,6}{x}=\frac{-12}{42}\Rightarrow x=-2,6:\frac{-12}{42}=\frac{13}{5}:\frac{2}{7}=\frac{91}{10}=9,1\)
Ta có: \(\frac{-2,6}{x}=\frac{-12}{42}\)
\(\Rightarrow x=42.\left(-2,6\right):\left(-12\right)\)
\(\Rightarrow x=9,1\)
Vậy x = 9,1
a)\(\) Ta có : x / 3,15 = 0,15 / 7,2
(=) x = 0,15 . 3,15 / 7,2
= 21 / 320
b) Ta có : -2,6 / x = -12 / 42
(=) x = -2,6 . 42 / -12
= 91 / 10