`(2,7x-1 1/2x):2/7=[-21]/4`
`27/10x-3/2x=[-21]/4xx2/7`
`(27/10-3/2)x=[-3]/2`
`6/5x=[-3]/2`
`x=[-3]/2:6/5=[-5]/4`
Đúng 2
Bình luận (2)
Bài 3: Ghi số tự nhiên
Các câu hỏi tương tự
Tìm số nguyên x biết:
a) -4dfrac{3}{5} x 2dfrac{4}{3} le x le -2dfrac{3}{5} : 1dfrac{6}{15}
b) -4dfrac{1}{3} (dfrac{1}{2}-dfrac{1}{6} ) le x ledfrac{2}{3}left(dfrac{1}{3}-dfrac{1}{2}-dfrac{3}{7}right)
c) dfrac{x+1}{35}+dfrac{x+2}{34}+dfrac{x+3}{33}dfrac{x+4}{32}+dfrac{x+5}{31}dfrac{x+6}{30}
Đọc tiếp
Tìm số nguyên x biết:
a) \(-4\dfrac{3}{5}\) x \(2\dfrac{4}{3}\) \(\le\) x \(\le\) \(-2\dfrac{3}{5}\) : \(1\dfrac{6}{15}\)
b) \(-4\dfrac{1}{3}\) (\(\dfrac{1}{2}-\dfrac{1}{6}\) ) \(\le\) x \(\le\dfrac{2}{3}\left(\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{3}{7}\right)\)
c) \(\dfrac{x+1}{35}+\dfrac{x+2}{34}+\dfrac{x+3}{33}=\dfrac{x+4}{32}+\dfrac{x+5}{31}\dfrac{x+6}{30}\)
\(\dfrac{1}{7}-\dfrac{8}{7}:8-3:\dfrac{3}{4}\cdot\left(-2\right)^2\)
tính giá trị biểu thức sau một cách hợp lí :
\(A=\dfrac{-10}{3}+\dfrac{19}{6}.\dfrac{7}{5}-\dfrac{19}{3}.\dfrac{1}{10}+\dfrac{19}{10}.\dfrac{4}{3}\)
\(M=\dfrac{1+2+2^2+2^3+....+2^{2012}}{2^{2014}-2}\)
\(\dfrac{1}{\begin{matrix}1\times&2\end{matrix}}+\dfrac{1}{\begin{matrix}2\times&3\end{matrix}}+\dfrac{1}{\begin{matrix}3\times&4\end{matrix}}+...........+\dfrac{1}{x\times\left(x+1\right)}=\dfrac{996}{997}\)
\(\dfrac{1}{2}\)-x + \(\dfrac{2}{3}\)x -1 = -3\(\dfrac{1}{3}\)
\(\dfrac{-5}{6}\) + \(\dfrac{8}{3}\) + \(\dfrac{-29}{6}\) ≤ x ≤ \(\dfrac{-1}{2}\) + 2 + \(\dfrac{5}{2}\)
Tìm x thuộc Z,biết:
\(\dfrac{-2}{7}\)<\(\dfrac{x}{3}\)<\(\dfrac{11}{4}\)
1) Tính
B=(1+\(\dfrac{1}{2}\)).(1+\(\dfrac{1}{3}\)).(\(1+\dfrac{1}{4}\)).....(\(1+\dfrac{1}{99}\))
tìm x:
\(\dfrac{x+1}{3}\)= \(\dfrac{-3}{-9}\)