2/3(1/2-1/3)<x/9<(1+1/3):3
\(\Leftrightarrow\dfrac{2}{3}\cdot\dfrac{1}{6}< \dfrac{x}{9}< \dfrac{4}{9}\)
\(\Leftrightarrow\dfrac{1}{9}< \dfrac{x}{9}< \dfrac{4}{9}\)
hay \(x\in\left\{2;3\right\}\)
=>Có hai số
Tìm \(x\) là số tự nhiên biết:
a)\(\dfrac{2}{3}+\dfrac{3}{4}< x< 1\dfrac{1}{3}+\dfrac{4}{5}\) b)\(\dfrac{5}{6}-\dfrac{1}{4}< x< 2\dfrac{1}{3}-\dfrac{2}{5}\)
mn giúp mik vs mik cần gấp
xin lỗi mình đăng muộn bn nào đag on giải giúp mik với mai mik ik học cô kỉm tra.
Tìm \(x\) là số tự nhiên biết:
a)\(\dfrac{2}{3}+\dfrac{3}{4}< x< 1\dfrac{1}{3}+\dfrac{4}{5}\) b)\(\dfrac{5}{6}-\dfrac{1}{4}< x< 2\dfrac{1}{3}-\dfrac{2}{5}\)
mik cần gấp.
1. \(\left(y+\dfrac{1}{3}\right)\)+\(\left(y+\dfrac{1}{9}\right)\)+\(\left(y+\dfrac{1}{27}\right)\)+\(\left(y+\dfrac{1}{81}\right)\)=\(\dfrac{56}{81}\)
2. 18:\(\dfrac{Xx0,4+0,32}{X}\)+5=14
3. \(\dfrac{3xX}{2}\)=\(\dfrac{2}{5}+\)X\(+\dfrac{1}{3}\)
4. X-\(\dfrac{11}{15}\)=\(\dfrac{3+X}{5}\)
Bài 1: Tính
a) \(\dfrac{7}{5}+3\dfrac{2}{5}-1\dfrac{1}{2}\)
b) 3 x 2\(\dfrac{4}{9}\)x\(\dfrac{3}{2}\)
c) \(\dfrac{5}{9}x\left(2\dfrac{1}{6}-1\dfrac{2}{3}\right)\)
Bài 5: (Đề 2) Tính
a) \(2-1\dfrac{5}{6}+2\dfrac{2}{3}\)=........
b) \(\dfrac{5}{9}x\left(2\dfrac{5}{6}-1\dfrac{2}{3}\right)\)=..........
c)\(1\dfrac{1}{3}:\left(2+1\dfrac{1}{6}:2\dfrac{5}{6}\right)\)=..........
d) \(2\dfrac{3}{5}:\dfrac{3}{4}x1\dfrac{4}{5}\) =..........
tìm \(x\) là số tự nhiên biết:
a)\(\dfrac{2}{3}+\dfrac{3}{4}< x< 1\dfrac{1}{3}+\dfrac{4}{5}\) b)\(\dfrac{5}{6}-\dfrac{1}{4}< x< 2\dfrac{1}{3}-\dfrac{2}{5}\)
\(\left(x+\dfrac{1}{3}\right)+\left(x+\dfrac{1}{9}\right)+\left(x+\dfrac{1}{27}\right)+\left(x+\dfrac{1}{81}\right)=\dfrac{56}{81}\)
Tìm x:
\(\dfrac{1}{3}\) + \(\dfrac{1}{6}\)+ \(\dfrac{1}{10}\)+ ...+ \(\dfrac{1}{xx\left(x+1\right):2}\)= \(\dfrac{2017}{2019}\)
Mọ người giúp em với ạ! Em cảm ơn!
tính giá trị biểu thức
\(\dfrac{3}{5}x\dfrac{2}{3}:\dfrac{1}{2}=?\)
\(\dfrac{2}{3}\cdot\dfrac{1}{2}+\dfrac{1}{3}=?\)
\(\left(\dfrac{5}{7}+\dfrac{2}{5}\right):\dfrac{11}{7}=?\)
a \(\dfrac{x}{y}\) - \(\dfrac{3}{8}\) = \(1\dfrac{1}{2}\) b \(\dfrac{4}{9}\) ː \(\dfrac{x}{y}\) = \(1\dfrac{1}{2}\)
giup mik với mik cần gấp
