\(\dfrac{x+10}{27}=\dfrac{x}{9}\\ =>\dfrac{x+10}{27}=\dfrac{3x}{27}\\ =>x+10=3x\\ < =>2x=10\\ < =>x=5\)
\(\dfrac{x+10}{27}=\dfrac{x}{9}\)
\(\Rightarrow9.\left(x+10\right)=27.x\)
\(9x+90=27x\)
\(9x-27x=-90\)
\(-18x=-90\)
\(x=-90:-18\)
\(x=5\)
\(\dfrac{x+10}{27}=\dfrac{x}{9}\\ =>\dfrac{x+10}{27}=\dfrac{3x}{27}\\ =>x+10=3x\\ < =>2x=10\\ < =>x=5\)
\(\dfrac{x+10}{27}=\dfrac{x}{9}\)
\(\Rightarrow9.\left(x+10\right)=27.x\)
\(9x+90=27x\)
\(9x-27x=-90\)
\(-18x=-90\)
\(x=-90:-18\)
\(x=5\)
\(\dfrac{x-1}{29}+\dfrac{x-2}{28}+\dfrac{x-3}{27}+\dfrac{x}{10}-6=0\)
Bài 4. Tìm x biết:
a. \(\dfrac{x}{5}=\dfrac{2}{5},\dfrac{3}{8}=\dfrac{6}{x},\dfrac{1}{9}=\dfrac{x}{27}\)
b. \(\dfrac{4}{x}=\dfrac{8}{6},\dfrac{3}{x-5}=\dfrac{-4}{x+2},\dfrac{x}{-2}=\dfrac{-8}{x}\)
\(\text{S=}\dfrac{1}{3}+\dfrac{2}{9}+\dfrac{3}{27}+...+\dfrac{2019}{3^{2019}}ChứngminhS< \dfrac{3}{4}\)
tìm x biết
\(\dfrac{7}{9}:\left(2+\dfrac{3}{4}.x\right)+\dfrac{5}{9}=\dfrac{23}{27}\)
|x|\(-\dfrac{3}{4}=\dfrac{5}{3}\)
\(\left|2.x-\dfrac{1}{3}\right|+\dfrac{5}{6}=1\)
giúp mk vs nhanh lên mình đang bận
\(\dfrac{x}{27}=\dfrac{2}{9}-\dfrac{1}{3}\)
a) tìm x :\(\dfrac{2}{1.4}x+\dfrac{2}{4.7}x+\dfrac{2}{7.10}x+....+\dfrac{2}{31.344}x=10\)
b)so sánh hai phân số sau : A=\(\dfrac{6^{2020}+1}{6^{2021}+1}\)và B=\(\dfrac{6^{\text{2021}}+1}{\text{6}^{\text{2022}}+1}\)
ét o ét giúp với ạ
Viết tập hợp A các số tự nhiên x sao cho:
a, \(\dfrac{-36}{9}\) ≤ x < \(\dfrac{-15}{5}\)
b, \(\dfrac{-27}{3}\) < x ≤ \(\dfrac{12}{4}\)
c, \(\dfrac{-21}{7}\) < x < \(\dfrac{-12}{6}\)
Tìm x biết: a) x + \(\dfrac{2}{3}=\dfrac{4}{27}\) b) \(\dfrac{3}{4}x-\dfrac{7}{3}=\dfrac{1}{4}x+\dfrac{1}{6}\)
c) \(\dfrac{13}{10}x-\dfrac{5}{2}=\dfrac{7}{2}\) d) (3\(x\) + 2) \(\left(\dfrac{-2}{5}x-7\right)=0\)
x2 - \(\dfrac{3}{7}.\dfrac{35}{27}=\dfrac{11}{9}\)
Tìm x, biết