\(\dfrac{1}{6}x+\dfrac{1}{10}x-\dfrac{4}{15}+1=0\Leftrightarrow\dfrac{4}{15}x=\dfrac{-11}{15}\Leftrightarrow x=\dfrac{-11}{4}\) vậy \(x=\dfrac{-11}{4}\)
Tìm x, y\(\in\)Z, biết:
a) \(\dfrac{5}{x}+\dfrac{y}{4}=\dfrac{1}{8}\)
b) \(\dfrac{1}{x}=\dfrac{1}{6}+\dfrac{y}{3}\)
c) \((x+1)(x-2)<0\)
d) \((x-2)(x+\dfrac{2}{3})>0\)
Tìm \(x\in Q\), biết rằng :
a) \(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
b) \(2x\left(x-\dfrac{1}{7}\right)=0\)
c) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
Bài 1: Tính
\(\dfrac{1}{2}.\dfrac{1}{-3}+\dfrac{1}{-3}.\dfrac{1}{4}+\dfrac{1}{4}.\dfrac{1}{-5}+\dfrac{1}{-5}.\dfrac{1}{6}\)
Bài 2: Tìm x ∈ Q:
\(\left(x-\dfrac{4}{7}\right).\left(x+\dfrac{1}{2}\right)>0\)
Bài 1:
a) A=\(\dfrac{\dfrac{3}{4}-\dfrac{3}{11}+\dfrac{3}{13}}{\dfrac{5}{7}-\dfrac{5}{11}+\dfrac{5}{13}}\) + \(\dfrac{\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}}{\dfrac{5}{4}-\dfrac{5}{6}+\dfrac{5}{8}}\)
b) Cho 3 số x, y, z là 3 số khác 0 thoả mãn điều kiện: \(\dfrac{y+z-x}{x}\) = \(\dfrac{z+x-y}{y}\) = \(\dfrac{x+y-z}{z}\)
Hãy tính giá trị biểu thức: B=(1+\(\dfrac{x}{y}\)) (1+\(\dfrac{y}{z}\)) (1+\(\dfrac{z}{x}\))
Tìm \(x\in Q\), biết rằng:
a) \(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
b) \(2x.\left(x-\dfrac{1}{7}\right)=0\)
c) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
tìm x bt
\(\dfrac{x+4}{2000}\)+\(\dfrac{x+3}{2001}\)=\(\dfrac{x+2}{2002}\)+\(\dfrac{x+1}{2003}\)
bài 1: Tìm x biết:
a,\(x+\dfrac{1}{4}=\dfrac{3}{4}\)
b,\(\dfrac{3}{4}-\dfrac{2}{5}x=\dfrac{29}{60}\)
c,\(2x-\dfrac{1}{3}=\dfrac{-5}{6}\)
d,\(2-x:\dfrac{3}{4}=\dfrac{1}{2}\)
e,\(\dfrac{11}{12}-\dfrac{2}{3}|x|=\dfrac{3}{8}\)
f,\(|2x-1|=5\)
lưu ý: Có câu có 2 trường hợp
Các bn giúp mk với
2. Tìm x, biết
a) \(\dfrac{3}{4}\)+\(\dfrac{1}{4}\): x =\(\dfrac{2}{5}\)
b) 2x.(x -\(\dfrac{1}{7}\))=0
Giúp mình với
Tìm tập hợp các số nguyên x, biết rằng :
\(4\dfrac{5}{9}:2\dfrac{5}{18}-7< x< \left(3\dfrac{1}{5}:3,2+4,5.1\dfrac{31}{45}\right):\left(-21\dfrac{1}{2}\right)\)
