\(50\%\dfrac{-3}{4}x^2=\dfrac{-5}{2}\)
\(\Leftrightarrow\dfrac{-3}{8}x^2=\dfrac{5}{2}\)
\(\Leftrightarrow x^2=\dfrac{5}{2}-\dfrac{-3}{8}\)
\(\Leftrightarrow x^2=\dfrac{23}{8}\)
\(\Leftrightarrow x=\sqrt{\dfrac{23}{8}}\approx1,696\)
\(50\%\dfrac{-3}{4}x^2=\dfrac{-5}{2}\)
\(\Leftrightarrow\dfrac{-3}{8}x^2=\dfrac{5}{2}\)
\(\Leftrightarrow x^2=\dfrac{5}{2}-\dfrac{-3}{8}\)
\(\Leftrightarrow x^2=\dfrac{23}{8}\)
\(\Leftrightarrow x=\sqrt{\dfrac{23}{8}}\approx1,696\)
\(\dfrac{2}{3}x+\dfrac{1}{2}x=\dfrac{5}{2}:3\dfrac{3}{4}\) giúp với ạ
\(\text{Tìm x, biết:}\)
\(a\)) \(20\text{%}x-x+\dfrac{1}{5}=\dfrac{3}{4}\)
\(b\)) \(\dfrac{2x+1}{3}=\dfrac{x-5}{2}\)
\(c\)) \(\left(x-\dfrac{3}{4}\right)\left(4+3x\right)=0\)
\(d\)) \(x-\dfrac{1}{3}x+\dfrac{1}{5}x=\dfrac{-26}{5}\)
\(e\)) \(50\text{%}x+\dfrac{2}{3}x=x-5\)
\(g\)) \(\dfrac{2}{3}\left(x+\dfrac{9}{5}\right)-\dfrac{3}{10}.\left(5x-\dfrac{1}{3}\right)=\dfrac{7}{15}\)
\(\dfrac{x+2}{3}=\dfrac{x-4}{5}\)
giúp mik với ạ
Tìm số nguyên x, biết
\(\dfrac{3}{5}< \dfrac{3}{x}< \dfrac{3}{2}; \dfrac{4}{x}< \dfrac{x}{8}< \dfrac{5}{x}\)
Giúp mình với, làm chi tiết nhé
\(\dfrac{x-1}{21}=\dfrac{3}{x+1}\)
\(2\dfrac{1}{2}x+x=2\dfrac{1}{17}\)
\(\left(x+\dfrac{1}{4}-\dfrac{2}{3}\right):\left(2+\dfrac{1}{6}-\dfrac{1}{4}\right)=\dfrac{7}{46}\)
\(2\dfrac{1}{3}x-1\dfrac{3}{4}x+2\dfrac{2}{3}=3\dfrac{3}{5}\)
Giúp mình với ! Mình cần gấp
Viết lại tập A={1;\(\dfrac{3}{4}\);\(\dfrac{3}{5}\);2;\(\dfrac{3}{7}\)} bằng cách nêu dấu hiệu đặc trưng.Mọi người giải giúp mình với ạ
Bài 1: Thực hiện phép tính: (tính nhanh nếu có thể)
Câu 49. \(7\dfrac{3}{5}-\left(2\dfrac{5}{7}+5\dfrac{3}{5}\right)\)
Câu 50. \(\dfrac{-1}{9}.\dfrac{15}{22}:\dfrac{-25}{9}\)
Giúp em 2 câu cuối với ạ <3
Cho: A= 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{3}\) + \(\dfrac{1}{4}\) + ... + \(\dfrac{1}{2^{100}-1}\)
Chứng minh rằng: 50 < A < 100
Giúp mình với!
\(\dfrac{-7}{x}\text{=}\dfrac{-21}{x-34}\) \(\dfrac{4-x}{-5}\text{=}\dfrac{-5}{4-x}\)
\(\dfrac{3}{x+2}\text{=}\dfrac{5}{2x+1}\) \(\dfrac{1}{2}\text{=}\dfrac{x+1}{3x}\)
\(\dfrac{-3}{x+1}\text{=}\dfrac{4}{2-2x}\)