tìm\(x\in z\)biết :

a.\(\frac{13}{15}-\left(\frac{13}{21}+x\right)\times\frac{7}{12}=\frac{7}{10}\)

b.\(\left(x+\frac{1}{4}-\frac{1}{3}\right)\div\left(2+\frac{1}{6}-\frac{1}{4}\right)=\frac{7}{46}\)

1 Tìm x

\(a,\frac{5}{7}-\left|3x-2\right|=0\)

\(b,\frac{13}{15}-\frac{13}{21}+x.\frac{7}{12}=\frac{7}{10}\)

CÁC BẠN GIÚP MÌNH VỚI

\(\frac{13}{15}\)\(-\left(\frac{13}{21}+x\right)\)\(.\frac{7}{12}\)\(=\frac{7}{10}\)

\(\left(4\frac{5}{37}-3\frac{4}{5}+8\frac{15}{23}\right)\)\(-\left(3\frac{5}{37}-6\frac{14}{29}\right)\)

GIUP MIK ROI MIK TICK CHO

Tính nhanh:

a,\(\frac{7}{13}\cdot\frac{7}{15}-\frac{5}{12}\cdot\frac{21}{39}+\frac{49}{91}\cdot\frac{8}{15}\)

b,\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)

1. Tính nhanh 

a, \(\frac{7}{13}.\frac{7}{15}-\frac{5}{12}.\frac{21}{39}+\frac{49}{91}.\frac{8}{15}\)

b, \(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right).\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)

c,\(\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}\)

Bài 2 : Tìm x, biết :

\(a.\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{15}{28}-\frac{11}{13}\right)\)

\(b.\left(\frac{7}{12}+x\right)-\frac{11}{12}=\frac{2}{3}\)

Tìm x:

\(\frac{\left(13\frac{2}{9}-15\frac{2}{3}\right)\cdot\left(30^2-5^4\right)}{\left(18\frac{3}{7}-17\frac{1}{4}\right)\cdot\left(25-12\cdot5^2\right)}\cdot x=\frac{\frac{2}{11}+\frac{3}{13}+\frac{4}{15}+\frac{5}{17}}{4\frac{1}{11}+\frac{5}{13}+\frac{9}{15}+\frac{13}{17}}\)