\(2\left(\dfrac{3}{4}x+\dfrac{1}{2}\right)-\dfrac{1}{2}\left(4-\dfrac{1}{3}x\right)=\dfrac{2}{3}\\ \dfrac{3}{2}x+1-2+\dfrac{1}{6}x=\dfrac{2}{3}\\ \dfrac{5}{3}x-1=\dfrac{2}{3}\\ \dfrac{5}{3}x=\dfrac{5}{3}\\ x=1\)
Bài 2: Tìm x:
a)\(\dfrac{x-1}{27}\)=\(\dfrac{-3}{1-x}\) c)\(3\times x=2\times y\) và\(x-2\times y=8\)
b)\(\dfrac{4}{5}\)-\(\left|x-\dfrac{1}{2}\right|\)=\(\dfrac{3}{4}\) d)\(\dfrac{x-1}{2005}\)=\(\dfrac{3-y}{2006}\) và x-4009=y
Tìm x.
\(1,\dfrac{3}{2}\left(x-\dfrac{1}{3}\right)-\dfrac{1}{2}\left(x+\dfrac{1}{2}\right)=\dfrac{1}{4}\)
\(2,3\left(x-2\right)-4\left(x+2\right)=x+2\)
\(3,4x\left(x-1\right)+4x-2\left(x+1\right)=-2\)
\(4,x\left(x+2\right)-3\left(x-1\right)=3\left(x+1\right)\)
Tìm số nguyên x biết: a) \(-4\dfrac{3}{5}.2\dfrac{4}{23}\le x\le-2\dfrac{3}{5}:1\dfrac{6}{15}\)
b)\(-4\dfrac{1}{3}.\left(\dfrac{1}{2}-\dfrac{1}{6}\right)\le x\le-\dfrac{2}{3}\left(\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{3}{4}\right)\)
a) Tìm tập hợp các số nguyên x, biết rằng\(4\dfrac{5}{9}:2\dfrac{5}{18}-7< x< \left(3\dfrac{1}{5}:3,2+4,5.1\dfrac{31}{45}\right):\left(-21\dfrac{1}{2}\right)\)
b) tìm x, biết \(\left|x+\dfrac{1}{2}\right|+\left|x+\dfrac{1}{6}\right|+\left|x+\dfrac{1}{12}\right|+\left|x+\dfrac{1}{20}\right|+....+\left|x+\dfrac{1}{110}\right|-11x\)
c)Tính gt biểu thức \(C=2x^3-5y^3+2015\) tại x,y thỏa mãn \(\left|x-1\right|+\left(y+2\right)^{20}=0\)
a,\(-4\dfrac{1}{3}.\left(\dfrac{1}{2}-\dfrac{1}{6}\right)< hoac=x< hoac=\dfrac{-2}{5}.\left(\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{3}{4}\right)\)
b, \(-4\dfrac{2}{5}.2\dfrac{4}{3}< hoac=x< hoac=-2\dfrac{3}{5}:1\dfrac{6}{15}\)
Tìm x biết :
\(\left|x-\dfrac{1}{2}\right|+\left|x-\dfrac{1}{3}\right|+\left|x-\dfrac{1}{4}\right|+....+\left|x-\dfrac{1}{10}\right|=2x\)
Tìm x biết :
a) \(\dfrac{1}{4}x-1+\dfrac{1}{3}\left(\dfrac{5}{2}x-7\right)-\left(\dfrac{5}{8}x-2\right)=\dfrac{7}{2}\)
b) \(\left|2-\dfrac{3}{2}x\right|-4=x+2\)
c) \(-3\left(\dfrac{2}{5}x-\dfrac{1}{5}\right)-x\left(x-\dfrac{1}{2}\right)=\dfrac{1}{6}-x^2\)
1 tìm x
a,\(\dfrac{1}{4}x-\left|-\dfrac{3}{10}\right|\)
\(\left(\dfrac{2}{5}-\dfrac{7}{10}x\right):1\dfrac{2}{3}=\dfrac{-3}{4}\)
\(\dfrac{7}{16}:\left(\dfrac{x}{4}+\dfrac{9}{2}\right)-1\dfrac{5}{6}=0\)
3. tìm x
a. \(\dfrac{1}{5}+x=\dfrac{-1}{2}\)
b. \(1\dfrac{3}{4}.x+1\dfrac{1}{2}=\dfrac{-4}{5}\)
c.\(\left|x+\dfrac{3}{4}\right|-5=-2\)
d.\(\dfrac{-5}{8}+x=\dfrac{4}{9}\)
a) \(\dfrac{a}{2}=\dfrac{b}{3};\dfrac{b}{4}=\dfrac{c}{5}\) và a+b+c=2 d) \(\dfrac{x+1}{3}=\dfrac{y-2}{4}=\dfrac{z-1}{13}\) và 2x-3y+z=42
b) 2a = 3b = 5c và a+b-c =3 i) x:y:z = 2:3:5 và x*y*z=810
c) \(\dfrac{x}{7}=\dfrac{y}{3}\) và x - 42 =y \(\dfrac{x}{2}=\dfrac{y}{3};\dfrac{y}{4}=\dfrac{z}{5}\) và x2 - y2 = -16
các bạn giúp mình với, mình k biết làm. help me!!!!!
