\(\dfrac{5}{7}:x+\dfrac{4}{5}=\dfrac{1}{6}\)
\(\Rightarrow\dfrac{5}{7}:x=\dfrac{1}{6}-\dfrac{4}{5}=-\dfrac{19}{30}\)
\(\Rightarrow x=\dfrac{5}{7}:\dfrac{-19}{30}\)
\(\Rightarrow x=\dfrac{-150}{133}\)
tìm x,y thuộc z
a. \(\dfrac{-1}{4}:\dfrac{-3}{4}+\dfrac{1}{2}< x< \dfrac{7}{8}-\dfrac{1}{2}:\dfrac{-5}{6}\)
Tìm \(x\)
1. \(\dfrac{1}{7}=\dfrac{8}{-x}\)
2. \(\dfrac{3x}{9}=\dfrac{2}{6}\)
3. \(4\dfrac{2}{5}:\left(\dfrac{-33}{10}\right)+x=-1\dfrac{5}{6}\)
4. \(45\%.x-2\dfrac{3}{8}=-1\dfrac{31}{40}\)
5. \(\left(x-2\dfrac{1}{4}\right):\left(-\dfrac{5}{6}\right)=3\)
a)thực hiện phép tính
A=[\(\dfrac{12-\dfrac{12}{7}-\dfrac{12}{289}-\dfrac{12}{85}}{4-\dfrac{4}{7}-\dfrac{4}{289}-\dfrac{4}{85}}\):\(\dfrac{5+\dfrac{5}{13}+\dfrac{5}{169}+\dfrac{5}{91}}{6+\dfrac{6}{13}+\dfrac{6}{169}+61}\)].\(\dfrac{158158158}{711711711}\)
b)tìm x biết
\(-\dfrac{2}{3}\)(x-\(\dfrac{1}{4}\))=\(\dfrac{1}{3}\)(2x-1)
\(\dfrac{1}{5}\).2x+\(\dfrac{1}{3}\).2x+1=\(\dfrac{1}{5}\).27+\(\dfrac{1}{3}\).28
c)tìm 2 số tự nhiên a và b biết tổng ƯCLN và BCNN của chúng là 15
d)tìm x nguyên thỏa mãn:/x+1/+/x-2/+/x+7/=5x-10
CÁC BN GIÚP MÌNH NHA MÌNH ĐANG CẦN GẤP
1. Tìm x, biết:
a, \(1\dfrac{3}{5}\) + \(\dfrac{\dfrac{2}{7}+\dfrac{2}{17}+\dfrac{2}{37}}{\dfrac{5}{7}+\dfrac{5}{17}+\dfrac{5}{37}}\) . x = \(\dfrac{16}{5}\)
b, (\(\dfrac{1}{24.25}\) + \(\dfrac{1}{25.26}\) + . . . + \(\dfrac{1}{39.40}\) ) . 120 + x. \(\dfrac{1}{3}\) = -4
c, \(\left|x-\dfrac{1}{3}\right|\) . 2 + \(\dfrac{4}{5}\) = 0,24
d, \(\dfrac{24}{7x-3}\) = \(\dfrac{-4}{25}\)
e, ( 50% x + \(5\dfrac{1}{4}\) ) , \(\dfrac{-2}{3}\) = \(2\dfrac{5}{6}\)
f, \(1\dfrac{1}{3}\) - 25%\(\dfrac{-5}{12}\) + 2x = 1,6 : \(\dfrac{3}{5}\)
2. tìm x
a. \(\dfrac{6}{5}\)- x =\(\dfrac{-3}{4}\)
b. \(\dfrac{3}{4}\)x - \(\dfrac{2}{3}\)x = \(\dfrac{-7}{12}\)
c. | \(\dfrac{2}{3}\)x - \(\dfrac{1}{2}\)| -1 = \(\dfrac{5}{6}\)
d. 3,2 x - (\(\dfrac{4}{5}\)+\(\dfrac{2}{3}\)) : \(3\dfrac{2}{3}\)=\(\dfrac{7}{20}\)
a) \(\dfrac{\left(3+\dfrac{1}{6}\right)-\dfrac{2}{5}}{\left(5-\dfrac{1}{6}\right)+\dfrac{7}{10}}\)
b) \(\dfrac{\left(4,08-\dfrac{2}{25}\right):\dfrac{4}{17}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{7}}\)
c) \(\dfrac{2-\dfrac{1}{4}+\dfrac{1}{3}-\dfrac{3}{5}}{3-\dfrac{1}{5}-\dfrac{5}{3}}\)
Bt1:Tìm x thuộc Z biết:
a,\(\dfrac{1}{3}\) + \(\dfrac{-2}{5}\) + \(\dfrac{1}{6}\) + \(\dfrac{-1}{5}\) ≤ x < \(\dfrac{-3}{4}\) + \(\dfrac{2}{7}\) + \(\dfrac{-1}{4}\) + \(\dfrac{3}{5}\) + \(\dfrac{5}{7}\)
Bt2:Tìm a,b ϵ N biết: \(\dfrac{a}{5}\) - \(\dfrac{2}{b}\) =\(\dfrac{2}{15}\)
2. tìm x
a. \(\dfrac{x}{8}\)=\(\dfrac{-9}{6}\)
b. \(\dfrac{4}{9}\)+\(\dfrac{7}{3}\):x=\(\dfrac{1}{5}\)
c. \(\dfrac{-5}{9}\)- x=\(\dfrac{4}{3}\)
d. x +\(\dfrac{4}{17}\)=\(\dfrac{2}{34}\)
e. \(\dfrac{3}{4}\).x=\(\dfrac{7}{8}\)
f. \(5\dfrac{4}{7}\): x=11
tìm x biết :
1.\(\dfrac{-5}{6}+\dfrac{8}{3}+\dfrac{-29}{6}\le x\le\dfrac{-1}{2}+2+\dfrac{5}{2}\)
2.\(\left(2,7x-1\dfrac{1}{2}x\right):\dfrac{2}{7}=\dfrac{-21}{4}\)
3.\(\left|2x-\dfrac{3}{4}\right|=1\)
làm hộ mik 3 con này cái
