\(\left\{{}\begin{matrix}\dfrac{4}{x}=0,5=\dfrac{1}{2}\\-\dfrac{y}{6}=0,5=\dfrac{1}{2}\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{2.4}{1}=8\\y=\dfrac{\left(-1\right).6}{2}=-3\end{matrix}\right.\)
tìm các số nguyên x và y sao cho
a,\(\dfrac{4}{x}+\dfrac{y}{3}=\dfrac{5}{6}\) b, \(\dfrac{5}{x}-\dfrac{y}{3}=\dfrac{1}{6}\) c, \(\dfrac{x}{6}-\dfrac{2}{y}=\dfrac{1}{30}\)
Tìm x, y \(\in Z\) thỏa mãn:
a. \(\dfrac{x}{3}-\dfrac{1}{y}=\dfrac{1}{2}\)
b. \(\dfrac{4}{x}+\dfrac{y}{3}=\dfrac{1}{6}\)
c.\(\dfrac{5}{x}-\dfrac{1}{6}=\dfrac{y}{3}\)
Tìm các số tự nhiên x, y sao cho:
a) \(\dfrac{x}{3}-\dfrac{4}{y}=\dfrac{1}{5}\)
b) \(\dfrac{5}{x}-\dfrac{y}{3}=\dfrac{1}{6}\)
c) \(\dfrac{x}{6}-\dfrac{2}{y}=\dfrac{1}{3}\)
Bài 1 : Tìm x
a) 4\(\dfrac{1}{2}\)x : \(\dfrac{5}{12}\)=0,5 b)1,5+1\(\dfrac{1}{4}\).x= \(\dfrac{2}{3}\) c) 7,5.1\(\dfrac{3}{4}\)=\(6\dfrac{2}{5}\) d)(x - 5):\(\dfrac{1}{3}\)=\(\dfrac{2}{5}\) e) (4,5-2x):\(\dfrac{3}{4}\)=1\(\dfrac{1}{3}\) f) (2,7x - 1\(\dfrac{1}{2}\)x) : \(\dfrac{2}{7}=\dfrac{-21}{7}\)
Bài 2 : tìm a,b biết
\(\dfrac{a}{27}=\dfrac{-5}{9}=\dfrac{-45}{b}\)
thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{-5}{9}+1\dfrac{5}{9}.\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{104}{195}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
tìm x
\(60\%x+0,4x+x:3=2\)
\(-2x-\dfrac{-3}{5}:\left(0,5\right)^2=-1\dfrac{1}{4}\)
\(\left(\dfrac{2}{3}-x\right):\dfrac{3}{4}=\dfrac{1}{5}\)
tìm các số nguyên x, y biết
a, \(\dfrac{24}{7x-3}\)=\(\dfrac{-4}{25}\)
b, \(\dfrac{4}{x-6}\)=\(\dfrac{y}{24}\)=\(\dfrac{-12}{18}\)
c, \(\dfrac{-1}{5}\)<\(\dfrac{x}{8}\)<\(\dfrac{1}{4}\)
d, \(\dfrac{x+46}{20}\)=x\(\dfrac{2}{5}\)
f, y\(\dfrac{5}{y}\)=\(\dfrac{86}{y}\)
Câu 1: Tìm x,y \(\in\) x biết:
\(\dfrac{x-4}{y-3}=\dfrac{4}{3}\) và x-y=5
Câu 2: Tình:
\(B=\dfrac{10}{56}+\dfrac{10}{140}+\dfrac{10}{260}+...+\dfrac{10}{1400}\)
Câu 3: Tìm x biết
38 - ( |x+10|+13)=\(\left(-6\right)^{20}:\left(9^9.4^{10}\right)\)
\(0,5.x-\dfrac{2}{3}.x=\dfrac{5}{12}\)
1. Tính:
a.\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+...+\dfrac{1}{9.10}\)
b.\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{99.100}\)
2. Tìm x , biết:
a. \(\dfrac{2}{5}+\dfrac{4}{5}x-\dfrac{7}{5}=\dfrac{9}{5}\)
b. \(\dfrac{2}{5}x-\dfrac{6}{4}=\dfrac{8}{5}\)
bài này ko được coppy trên mạng
