\(a)\dfrac{1}{3}x+\dfrac{2}{5}\left(x+1\right)=0\)
\(\Leftrightarrow\dfrac{1}{3}x+\dfrac{2}{5}x+\dfrac{2}{5}=0\)
\(\Leftrightarrow x\left(\dfrac{5}{15}+\dfrac{6}{15}\right)=\dfrac{-2}{5}\)
\(\Leftrightarrow x.\dfrac{11}{15}=\dfrac{-2}{5}\)
\(\Leftrightarrow x=\dfrac{-2}{5}.\dfrac{15}{11}\)
\(\Leftrightarrow x=\dfrac{-6}{11}\)
Bài 2:Tìm x biết:
a)\(\dfrac{1}{7}+x=\dfrac{-2}{3}\)
b)\(\dfrac{-2}{3}:x=\dfrac{-5}{6}\)
c)\(\left\{\dfrac{3}{5}-2x\right\}.\dfrac{5}{8}=1\)
d)\(\dfrac{3}{4}+\dfrac{2}{5}x=\dfrac{29}{60}\)
e)\(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
f)\(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
g)\(\left|X+\dfrac{1}{3}\right|-4=\dfrac{-1}{2}\)
h)\(\left(\dfrac{1}{32}\right)^x.8^{2x}=512\)
i)\(5,3x+\left(-3,3\right)x+1,7=-4,9\)
tìm x
\(\dfrac{5}{3}x-2\dfrac{1}{3}=-\dfrac{4}{3}.1\dfrac{1}{8}-\dfrac{2}{3}\)
\(2\dfrac{1}{6}:x-\dfrac{-5}{8}=\dfrac{-7}{15}:4\dfrac{1}{5}-\dfrac{-6}{7}\)
\(\left(\dfrac{5}{6}x-0,3\right):2\dfrac{1}{3}=25\%\)
\(\dfrac{4}{7}-\dfrac{2}{3}x=1,5+\dfrac{4}{5}x\)
GIÚP MÌNH NHÉ
a)(\(\dfrac{2}{9}\)(6x-\(\dfrac{3}{4}\))-3(\(\dfrac{1}{4}\)x-\(\dfrac{1}{5}\))=\(\dfrac{-8}{15}\)
b)\(\dfrac{3}{4}\)(x-\(\dfrac{8}{9}\))-5(x-\(\dfrac{11}{15}\))+\(\dfrac{1}{2}\)x=5\(\dfrac{1}{12}\)
c)\(\dfrac{2}{3}\)(-3x-\(\dfrac{6}{5}\))-\(\dfrac{5}{7}\)(\(\dfrac{49}{15}\)-14x)=-2\(\dfrac{1}{3}\)
d)(12\(\dfrac{7}{8}\)-10\(\dfrac{13}{8}\)):x-1\(\dfrac{7}{33}\):\(\dfrac{8}{11}\)=1\(\dfrac{2}{3}\)
tìm x
a,\(\dfrac{5}{6}-\left(\dfrac{3}{6}x-\dfrac{1}{5}\right)=\dfrac{-5}{12}\)
b\(\left(4x-3\right).\left(\dfrac{5}{4}x+2\right)=0\)
c\(\left|\dfrac{7}{8}x-\dfrac{2}{3}\right|-\dfrac{3}{4}=1,5\)
d\(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right)^3=\dfrac{8}{125}\)
giúp mình nhé mình đang cần gấp
a,\(\dfrac{-4}{5}-\left(\dfrac{2}{3}x+1\dfrac{1}{4}\right)=\dfrac{2}{7}\)
b\(\dfrac{5}{6}+\left(\dfrac{3}{4}-\dfrac{1}{2}:x\right)=\dfrac{-2}{3}\)
c\(\left(\dfrac{4}{5}x-1\dfrac{1}{3}\right):\dfrac{3}{4}=0,7\)
d\(\dfrac{5}{6}-\dfrac{3}{4}x=1\dfrac{1}{3}+0,5x\)
giúp mình nhé mình đang cần gấp
TÌM X
A,\(\dfrac{3}{7}x-2\dfrac{1}{3}=0,5\)
b,\(\dfrac{4}{7}-\dfrac{2}{3}:x=1\dfrac{1}{4}\)
C,\(\left(\dfrac{2}{3}x+2\dfrac{1}{4}\right):3\dfrac{1}{5}=0,75\)
D,\(\left|\dfrac{4}{5}-\dfrac{2}{3}x\right|:\dfrac{1}{4}-\dfrac{2}{3}=1\)
GIÚP MÌNH NHÉ
Dạng 2: Tìm x
Bài 1: Tìm x biết:
a) \(\dfrac{x-1}{9}\) = \(\dfrac{8}{3}\) b) (\(\dfrac{3x}{7}+1\)) : (-4) = \(\dfrac{-1}{8}\) c) x + \(\dfrac{7}{12}\) = \(\dfrac{17}{18}-\) \(\dfrac{1}{9}\)
d) 0,5x - \(\dfrac{2}{3}x\) = \(\dfrac{7}{12}\) e) \(\dfrac{29}{30}-\) (\(\dfrac{13}{23}+x\)) = \(\dfrac{7}{46}\) f) (x + \(\dfrac{1}{4}-\dfrac{1}{3}\)) : (2 + \(\dfrac{1}{6}-\dfrac{1}{4}\)) =\(\dfrac{7}{46}\)
g) \(\dfrac{13}{15}-\) (\(\dfrac{13}{21}+x\)) . \(\dfrac{7}{12}\) = \(\dfrac{7}{10}\) h) 2. \(\mid\)\(\dfrac{1}{2}x-\dfrac{1}{3}\)\(\mid\) \(-\) \(\dfrac{3}{2}\) = \(\dfrac{1}{4}\) i) 3.(\(3x-\dfrac{1}{2}\))3 + \(\dfrac{1}{9}=0\)
Bài 2: Tìm các số nguyên x, y sao cho:
a) \(\dfrac{x}{3}\) = \(\dfrac{4}{y}\) ; b) \(\dfrac{x}{y}\) = \(\dfrac{2}{7}\)
Bài 3: Tìm \(x \in\)Z thỏa mãn: a) 10 + \(\mid\)\(x\)\(\) - 2\(\mid\) = 19 b) \(\mid\)\(x\) -3\(\mid\) < 5 c) 3. \(\mid\)\(x\) + 2\(\mid\) + 1 = 28
tìm x
a\(\dfrac{2}{3}x-\dfrac{5}{6}=-1\dfrac{1}{2}x+0,75\)
b\(\left(5x-3\right).\left(2x+5\right)=0\)
c\(\left(\dfrac{5}{6}:x-1\dfrac{1}{4}\right)^4=\dfrac{81}{16}\)
d\(\left|\dfrac{2}{5}x-0,2\right|.1\dfrac{1}{4}-2=1,5\)
giúp mình nhé
Tìm \(x,y\in Z\) biết
a) \(\dfrac{3}{x}+\dfrac{y}{3}=\dfrac{5}{6}\)
b)\(\dfrac{5}{x}-\dfrac{y}{3}=\dfrac{1}{6}\)
c)\(\dfrac{x}{6}-\dfrac{2}{y}=\dfrac{1}{30}\)
d)\(xy+2x-y=15\)
