tìm x :3/5 < x < 3/4
Các bạn giúp mik nha
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\(a,x+\dfrac{3}{7}=\dfrac{2}{5}+\dfrac{3}{10}\)
\(x+\dfrac{3}{7}=\dfrac{4}{10}+\dfrac{3}{10}\)
\(x+\dfrac{3}{7}=\dfrac{7}{10}\)
\(x=\dfrac{7}{10}-\dfrac{3}{7}\)
\(x=\dfrac{49}{70}-\dfrac{30}{70}\)
\(x=\dfrac{19}{70}\)
\(b,\dfrac{19}{20}-x=\dfrac{8}{5}-\dfrac{3}{4}\)
\(\dfrac{19}{20}-x=\dfrac{32}{20}-\dfrac{15}{20}\)
\(\dfrac{19}{20}-x=\dfrac{17}{20}\)
\(x=\dfrac{19}{20}-\dfrac{17}{20}\)
\(x=\dfrac{2}{20}\)
\(x=\dfrac{1}{10}\)
#Urushi☕
\(\left(x+\dfrac{1}{3}\right)\times\dfrac{9}{14}\times\dfrac{7}{3}-\dfrac{1}{3}=1:\dfrac{9}{5}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}-\dfrac{1}{3}=\dfrac{5}{9}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{5}{9}+\dfrac{1}{3}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{8}{9}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{8}{9}:\dfrac{3}{2}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{16}{27}\\ \Rightarrow x=\dfrac{16}{27}-\dfrac{1}{3}\\ \Rightarrow x=\dfrac{7}{27}\)
\(\Leftrightarrow\left|x-1\right|=4\Leftrightarrow\left[{}\begin{matrix}x-1=4\\1-x=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-3\end{matrix}\right.\)
các bạn giúp mk đi mà mk đag cần gấp lắm các bạn trả lời trg 10 phút có đc k ?
\(\dfrac{9}{15}=\dfrac{3}{5}=\dfrac{3\times17}{5\times17}=\dfrac{51}{85};\dfrac{2}{17}=\dfrac{2\times5}{17\times5}=\dfrac{10}{85}\)
\(\dfrac{6}{8}=\dfrac{3}{4};\dfrac{3}{4}\) giữ nguyên.
a \(\Leftrightarrow3x=12\Leftrightarrow x=4\)
b \(\Leftrightarrow\left[{}\begin{matrix}x-2=0\\2x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-\dfrac{3}{2}\end{matrix}\right.\)
c \(ĐKXĐ:x\ne2;x\ne-2\)
\(\Rightarrow\left(x+2\right)^2-6\left(x-2\right)=x^2\Leftrightarrow x^2+4x+4-6x+12=x^2\Leftrightarrow-2x+16=0\Leftrightarrow-2x=-16\Leftrightarrow x=8\left(TM\right)\)
a) Ta có: 3x-12=0
\(\Leftrightarrow3x=12\)
hay x=4
Vậy: S={4}
b) Ta có: (x-2)(2x+3)=0
\(\Leftrightarrow\left[{}\begin{matrix}x-2=0\\2x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{-3}{2}\end{matrix}\right.\)
Vậy: \(S=\left\{2;\dfrac{-3}{2}\right\}\)
x nhân 9 nhân x=120
x nhân (9+1)=120
x nhân 10 =120
x =120:10
x =12
x-x nhân 1/6=3/5
x nhân (1/6+1)=3/5
x nhân 7/6=3/5
x =3/5:7/6
x =18/35