Question

[Nguyễn Minh Vũ]

đó làm hộ đi

Answer 1

[Yen Nhi]

`Answer:`

Bài 1.

a. \(-\frac{1}{6}+\frac{7}{14}-\left(\frac{1}{12}-\frac{3}{12}\right)\)

\(=-\frac{1}{6}+\frac{1}{2}-\frac{-2}{12}\)

\(=-\frac{1}{6}+\frac{1}{2}+\frac{1}{6}\)

\(=\left(-\frac{1}{6}+\frac{1}{6}\right)+\frac{1}{2}\)

\(=\frac{1}{2}\)

b. \(1\frac{1}{11}+\frac{4}{11}:\left(-4\right)-\frac{1}{4}\)

\(=\frac{12}{11}+\frac{4}{11}.-\frac{1}{4}-\frac{1}{4}\)

\(=\frac{12}{11}+-\frac{4}{44}-\frac{1}{4}\)

\(=\frac{48}{44}-\frac{4}{44}-\frac{11}{44}\)

\(=\frac{3}{4}\)

c. \(2,86.4+3,14.4-6,01.5+3^2\)

\(=4.\left(2,86+3,14\right)-30,05+9\)

\(=4.6-21,05\)

\(=2,95\)

Bài 2.

a. \(\frac{1}{3}-x=-\frac{1}{2}+\frac{2}{3}\)

\(\Rightarrow\frac{1}{3}-x=\frac{1}{6}\)

\(\Rightarrow x=\frac{1}{3}-\frac{1}{6}\)

\(\Rightarrow x=\frac{1}{6}\)

b. \(\frac{x-1}{45}=-\frac{3}{5}.\frac{2}{6}\)

\(\Rightarrow\frac{x-1}{45}=-\frac{1}{5}\)

\(\Rightarrow x-1=-\frac{1}{5}:\frac{1}{45}\)

\(\Rightarrow x-1=-9\)

\(\Rightarrow x=-8\)