Question

[Đỗ Thị Minh Anh]

Bài 1: Tính nhanh

a, \(\frac{-3}{7}-\left(\frac{2}{3}-\frac{3}{7}\right)\)

b, \(\frac{2}{15}:\left(\frac{1}{3}.\frac{4}{5}-\frac{1}{3}.\frac{6}{5}\right)\)

Bài 2: Tìm x:

a, \(\frac{3}{4}+\frac{1}{4}.x=\frac{5}{8}\)

b, 25% . x+x= -1,25

Answer 1

[Trúc Giang]

Bài 1

a/ $\frac{-3}{7}-\left(\frac{2}{3}-\frac{3}{7}\right)$

$\backslash (=\backslash frac\{-3\}\{7\}-\backslash frac\{2\}\{3\}+\backslash frac\{3\}\{7\}\backslash )$

\(=\left(\frac{-3}{7}+\frac{3}{7}\right)-\frac{2}{3}\)

\(=0-\frac{2}{3}\)

\(=\frac{-2}{3}\)