1) Tính

a)\(\frac{25}{42}\)-\(\frac{20}{63}\)

b)\(\frac{9}{50}\)-\(\frac{13}{75}\)-\(\frac{1}{6}\)

c)\(\frac{2}{15}\)-\(\frac{2}{65}\)-\(\frac{4}{39}\)

2/Tìm x, biết

a) x+\(\frac{7}{12}\)=\(\frac{17}{18}\)-\(\frac{1}{9}\)

b)\(\frac{29}{30}\)-(\(\frac{18}{23}\)+x) =\(\frac{7}{69}\)

\(A=\frac{-7}{25}.\frac{39}{-14}.\frac{50}{78}\)

\(B=\frac{-3}{11}.\frac{-22}{66}.\frac{121}{15}\)

\(C=\frac{3}{7}.\frac{2}{5}.\frac{7}{3}.20.\frac{19}{72}\)

\(D=\frac{6}{7}.\frac{8}{13}+\frac{9}{13}.\frac{6}{7}-\frac{4}{13}.\frac{6}{7}\)
Tính giá trị biểu thức 

Tìm x:

a) 5\(\frac{4}{7}\): x =13

b) \(\frac{4}{7}\)x=\(\frac{9}{8}\)-0,125

c) \(\frac{2}{3}\)x-\(\frac{1}{2}\)=\(\frac{1}{10}\)

d) \(\frac{1}{3}\)x-0,5x = -1\(\frac{1}{4}\)

e) \(\frac{-5}{6}\)- x = \(\frac{7}{12}\)+ \(\frac{-1}{3}\)

f) \(\frac{x+2}{3}\)=\(\frac{x-2}{2}\)

g) \(\frac{2}{5}\)- \(\frac{1}{5}\): x = -25%

h) (2\(\frac{4}{5}\)x - 50): \(\frac{2}{3}\)= 51

i) \(\frac{2}{3}\)x -\(\frac{1}{2}\)x =\(\frac{5}{12}\)

j) \(\frac{7}{2}\)- |2x -\(\frac{3}{4}\)| = -\(\frac{7}{4}\)

k) (x : 6\(\frac{2}{7}\)+\(\frac{3}{7}\)) :2\(\frac{1}{5}\)-\(\frac{3}{7}\)= -2

l) (x +\(\frac{1}{5}\))² +\(\frac{17}{25}\)=\(\frac{26}{25}\)

m) (x +\(\frac{1}{2}\))(\(\frac{2}{3}\)- 2x) =0

Mọi người ơi giúp mình nhanh nha.

Ai giúp mình thì mình sẽ tick cho.

Tìm x biết :

a) \(\frac{2}{3}\)x - \(\frac{1}{2}\)= \(\frac{1}{10}\)

b) ( \(2\frac{4}{5}\)x - 50 ) :\(\frac{2}{3}\)= 51

c) \(\frac{2}{3}\)x - \(\frac{1}{2}\)x = \(\frac{5}{12}\)

d) \(\frac{17}{2}\)- | 2x - \(\frac{3}{4}\)| = \(-\frac{7}{4}\)

đ) ( x + \(\frac{1}{5}\))² + \(\frac{17}{25}\)= \(\frac{26}{25}\)

Tìm x biết :

a) \(\frac{2}{3}\)x - \(\frac{1}{2}\)= \(\frac{1}{10}\)

b) ( \(2\frac{4}{5}\)x - 50 ) : \(\frac{2}{3}\)= 51

C) \(\frac{2}{3}\)x - \(\frac{1}{2}\)x = \(\frac{5}{12}\)

D) \(\frac{17}{2}\)- | 2x - \(\frac{3}{4}\)| = \(-\frac{7}{4}\)

Đ) ( x + \(\frac{1}{5}\))² + \(\frac{17}{25}\)= \(\frac{26}{25}\)

Tìm x \(\in\) Z biết:

a) \(\frac{x}{5}\)= \(\frac{32}{80}\); \(\frac{13}{x}\)= \(\frac{26}{30}\); \(\frac{-x}{7}\)= \(\frac{22}{-77}\)

b) \(\frac{x}{9}\)= \(\frac{28}{36}\); \(\frac{-10}{x}\)=\(\frac{50}{55}\); \(\frac{23}{-x}\)=\(\frac{46}{50}\)

Tìm x :

a) \(\frac{-1}{4}\). (\(\frac{x}{4}\)+ \(\frac{-2}{7}\)+ \(\frac{2}{8}\)) = \(\frac{-1}{7}\)+ \(\frac{2}{14}\)

b) \(\frac{5-x}{12}\)+ \(\frac{5}{12}\)- \(\frac{1}{8}\)= \(\frac{3}{8}\)

c) \(\frac{-12}{25}\). (\(\frac{3}{4}\)- x + \(\frac{6}{11}\)) = 0.

Ai nhanh mình tick , mình rất gấp lắm rồi.

Tính a) (4 \(\frac{5}{37}\)- 3\(\frac{4}{5}\)+8\(\frac{15}{29}\)) - (3\(\frac{5}{37}\)- 6\(\frac{14}{29}\)

b) 60 \(\frac{7}{13}\)x (8\(\frac{7}{10}\)) +50\(\frac{8}{13}\)x (-8 \(\frac{7}{10}\)) - 11 \(\frac{2}{13}\)x (-8 \(\frac{7}{10}\)

c) (2 \(\frac{5}{6}\)+ 1\(\frac{4}{9}\)) : ( 10 \(\frac{1}{2}\)- 9 \(\frac{1}{2}\)

d) 1 \(\frac{5}{18}\)- \(\frac{5}{18}\)x (\(\frac{1}{15}\)+1\(\frac{1}{12}\))

e)\(\frac{-1}{7}\)x (9 \(\frac{1}{2}\) - 8,75) :\(\frac{2}{7}\) +0,625 :1 \(\frac{2}{3}\)