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\(\left(15x-3\right)^{2019}=1=1^{2019}\)
\(\Rightarrow15x-3=1\)
\(\Rightarrow15x=3\)
\(\Rightarrow x=\frac{3}{15}\)
\(\Rightarrow x=\frac{1}{5}\)
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\(\frac{3}{7}x=\frac{6}{15}x-1\)
\(\frac{3}{7}x-\frac{6}{15}x=-1\)
\(x\left(\frac{3}{7}-\frac{6}{15}\right)=-1\)
\(x.\frac{1}{35}=-1\)
\(x=-35\)
\(\frac{3}{7x}=\frac{6}{15x-1}\)
\(=>3\left(15x-1\right)=42x\)
\(=>45x-3=42x\)
\(=>3x=3\)
\(=>x=1\)
Ủng hộ nha
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\(\frac{1}{6x}+\frac{1}{10x}-\frac{4}{15x}+1=0\)
\(\Rightarrow\frac{1}{x}\left(\frac{1}{6}+\frac{1}{10}-\frac{4}{15}\right)+1=0\)
\(\Rightarrow\frac{1}{x}.0+1=0\)
\(\Rightarrow1=0\)( vô lý )
=> không có giá trị x thỏa mãn đề bài
Study well
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a, \(\dfrac{4}{5}\) + \(\dfrac{9}{15}\) : \(\dfrac{1}{15}\)
= \(\dfrac{4}{5}\) + \(\dfrac{9}{15}\) \(\times\) 15
= \(\dfrac{4}{5}\)+ 9
= \(\dfrac{4}{5}+\dfrac{45}{5}\)
= \(\dfrac{49}{5}\)
b, - \(\dfrac{5}{15}\) \(\times\) ( 1\(\dfrac{1}{2}\) - (-\(\dfrac{2}{7}\)) - (- \(\dfrac{14}{8}\)) - 1\(\dfrac{1}{3}\)
= - \(\dfrac{1}{3}\) \(\times\) ( \(\dfrac{3}{2}\)+\(\dfrac{2}{7}\)+ \(\dfrac{7}{4}\)) - \(\dfrac{4}{3}\)
= - \(\dfrac{1}{3}\) \(\times\) ( \(\dfrac{42}{28}\)+ \(\dfrac{8}{28}\)+ \(\dfrac{49}{28}\)) - \(\dfrac{4}{3}\)
= - \(\dfrac{1}{3}\) \(\times\) \(\dfrac{99}{28}\) - \(\dfrac{4}{3}\)
= - \(\dfrac{99}{84}\) - \(\dfrac{112}{84}\)
= - \(\dfrac{211}{84}\)
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\(\text{a) 15x - 82 = 8x - 12 }\)
\(15x-8x=-12+82\)
\(7x=70\)
\(\Leftrightarrow x=10\)
học tốt
mk trả lời là liền nha
15x - 82 =8x -12
=> 15x-8x = 82-12
=>7x = 70
=>x=10
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x=o nha