Bài 1: Tìm x, biết l) \(\left(x+1\right)\left(x+5\right)>0\) m) \(\frac{x+4}{2011}+\frac{x+3}{2012}+\frac{x+2}{2013}+\frac{x+1}{2014}=-4\)

Bài 1: Tìm x, biết d) \(\left(4\frac{2}{3}-2x\right).2\frac{1}{4}=1\frac{1}{2}\) e) \(\frac{3}{5}+\frac{4}{9}:x=\frac{2}{3}\) f) \(\frac{7}{35}:\left(x-\frac{1}{3}\right)=-\frac{2}{25}\)

Bài 1: Tìm x, biết: a) \(1\frac{1}{2}x+\frac{-4}{5}=4\) b) \(\frac{2}{3}x+\frac{-1}{2}x=\frac{-5}{12}\) c) \(\frac{3}{7}x-\frac{2}{3}x=\frac{10}{21}\)

Bài 1: Thực hiện phép tính(hợp lý nếu có thể). a) \(\left(-1\frac{1}{2}\right):\frac{3}{4}.\left(-4\frac{1}{2}\right)\) b) \(21-3\frac{3}{4}:\left(\frac{3}{8}-\frac{1}{6}\right)\) c) \(\frac{5}{4}-\frac{5}{4}:\left(\frac{3}{8}-\frac{1}{6}\right):\frac{11}{12}\)

\(^{\left(8-\frac{9}{4}+\frac{2}{7}\right)-\left(-6-\frac{3}{7}+\frac{5}{4}\right)-\left(3+\frac{2}{4}-\frac{9}{7}\right)}\)

\(\frac{4}{7}x-x=\frac{-4}{49}\)

\(\frac{2}{5}x+40\%x-1=\frac{1}{2}\)