ĐKXĐ: \(x\ne0\)
\(\dfrac{x}{2}=\dfrac{32}{x}\)
\(\Rightarrow x^2=2.32\)
\(\Rightarrow x^2=64\)
\(\Rightarrow x^2=8^2\)
\(\Rightarrow x=8\) hoặc \(x=-8\)
\(A.\dfrac{-15}{28}x\dfrac{7}{25}\\ B.\dfrac{-5}{14}x\dfrac{7}{-3}\\ C.\dfrac{-1}{5}-\dfrac{7}{15}x\dfrac{9}{35}\\ D.\dfrac{-3}{4}-(\dfrac{-1}{2})^2\\ E.\dfrac{-4}{5}-\dfrac{-4}{5}x\dfrac{15}{16}\\F.(\dfrac{3}{4}+\dfrac{-7}{2})x(\dfrac{2}{11}+\dfrac{12}{22})\)
Tìm x biết
a)\(\dfrac{11}{12}\).x + \(\dfrac{3}{4}\)= -\(\dfrac{1}{6}\)
b)3-\(\left(\dfrac{1}{6}-x\right)\).\(\dfrac{2}{3}\)=\(\dfrac{2}{3}\)
Tính:
a,(1-1/5)x(1-2/5)x(1-3/5)x.....x(1-9/5)
b,1/2x2/3x3/4x4/5x.....x9/10
X/2018-1/70-1/15-1/21-...-1/120=5/8
(11/12+11/12.23+11/23.34+....+2/89.100)+x=5/3
(2'11.13+2/13.15+...+2/19.21)-x+4+221/231=7/3
\(\dfrac{1}{2}x+\dfrac{x-2}{3}=1\)
tìm x biết:x(x+2)=0
\(x+\frac{1}{2}.x+\frac{x}{3}\)bằng\(\frac{5}{6}\)
-15/12 . x+ 3/7=6/5 .x -1/2
Cho A = 5/x+2
a.Tìm điều kiện của x để A là phân số?
b.Tìm số nguyên x để A = -1/2
c.Tìm số nguyên x để A là số nguyên
Tìm \(x\), biết :
a) \(x-\dfrac{1}{4}=\dfrac{5}{8}.\dfrac{2}{3}\)
b) \(\dfrac{x}{126}=\dfrac{-5}{9}.\dfrac{4}{7}\)