\(\dfrac{1}{6}x+\dfrac{1}{10}x-\dfrac{4}{15}x+1=0\)
\(\Leftrightarrow x.\left(\dfrac{1}{6}+\dfrac{1}{10}-\dfrac{4}{15}\right)+1=0\)
\(\Leftrightarrow0x+1=0\)
\(\Leftrightarrow x=-1\)( vô lý)
BT4: Tìm số nguyên x ,y biết:
1) \(\dfrac{x}{6}-\dfrac{1}{y}=\dfrac{1}{2}\)
2) \(\dfrac{y}{5}+\dfrac{1}{10}=\dfrac{1}{x}\)
Các bạn giúp mk nhé
bài 1: tìm x bt:
a\(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)
b, \(5\dfrac{4}{7}:x=13\)
c, (2 và 4/5.x-50) :2/3= 51
d,\(\left(x+\dfrac{1}{2}\right).\left(\dfrac{2}{3}-2x\right)=0\)
e, \(\dfrac{2}{3}-\dfrac{1}{2}x=\dfrac{5}{12}\)
giúp mk nhs!!!!!!!!!!
BT3: Tìm x, biết
3) \(\dfrac{3}{4}.x-\dfrac{5}{3}.x=\dfrac{7}{12}\)
4) \(x-\dfrac{1}{7}=\) \(\dfrac{\dfrac{4}{2011}-\dfrac{4}{2013}+\dfrac{4}{99}}{\dfrac{5}{2011}-\dfrac{5}{2013}+\dfrac{5}{99}}+\dfrac{1}{2}\)
Các bạn giúp mk nhé
Tìm \(x\) biết:
a) \(\dfrac{1}{3}\).( \(\dfrac{1}{2}\) - \(6\)) + 5\(x\) = \(x\) - \(\dfrac{3}{5}\)
b) \(\dfrac{3}{2}\). \(x\) - \(1\dfrac{1}{2}\) = \(x\) - \(\dfrac{3}{4}\)
c)\(x\) - \(\dfrac{5}{4}\) = \(\dfrac{1}{3}-\dfrac{3}{4}\) . \(x\)
d) \(\dfrac{3}{2}.\left(x-\dfrac{5}{3}\right)\)- \(\dfrac{7}{5}\) = \(x+1\)
e)\(\dfrac{2}{3}.\left|4x+3\right|=\dfrac{6}{15}\)
giúp mk với, mai mk phải nộp rồi
cách làm nữa nhé
1)tìm x:
a)\(\left|x\right|-\dfrac{3}{5}=\dfrac{5}{9}\) với x >0
b)-2\(\left|x\right|=\dfrac{-4}{3}\) với x<0
c)\(\dfrac{2}{5}-\left|\dfrac{1}{2}-x\right|=6\)
d)\(\dfrac{-5}{12}\)/ |\(\left|\left(\dfrac{\dfrac{-5}{6}}{x}\right)\right|=\dfrac{-5}{9}\)
2)tính các tích sau biết a*b=2,3
a)a-(-b) b)a*(-2b)
c)(-a)(-b) d)(-3a)(2b) giúp mình nhé nhanh nhất có thể mình đang cần gấp giúp mình nhé !thank
Tìm x, biết:
1. \(\left(\dfrac{2x}{5}+2\right):\left(-4\right)=-1\dfrac{1}{2}\)
2. x. ( x + 1) = 0
3. 2x - 16 = 40 + x
4. x : \(\dfrac{5}{3}\) + \(\dfrac{1}{3}\) = \(\dfrac{-2}{5}\)
5. 3\(\dfrac{1}{2}\) - \(\dfrac{1}{2}\) x = \(\dfrac{2}{3}\)
6. \(\dfrac{x}{4}=\dfrac{9}{x}\)
7. \(\dfrac{1}{3}+\dfrac{1}{2}:x=\) -0,25
1. Tìm x biết:
a) \(\left(-x-\dfrac{1}{9}\right)^2=\dfrac{4}{9}\)
b) \(1+\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{10}+...+\dfrac{1}{x.\left(x+1\right):2}=1\dfrac{1991}{1993}\)
Bài 1 : Tìm GTNN
A = \(\left(x-\dfrac{1}{4}\right)^2+\left|y+\dfrac{1}{4}\right|+\dfrac{13}{14}\)
Bài 2 : Tìm x , y là số nguyên
a) \(\dfrac{x+3}{5}-\dfrac{1}{y-1}=\dfrac{2}{5}\)
b) \(-1-\dfrac{7}{14}\le\dfrac{x}{3}\le1+\dfrac{12}{48}\)
c) \(\dfrac{2y+7}{y-2}\in Z\)
giúp mk với sáng mai mk có tiết toán
Bài 1. Tính giá trị biểu thức
125%.\((\dfrac{-1}{2})^2\):\((1\dfrac{5}{16}-1,5)+2008^0\)
\(\dfrac{2}{3.5}+\dfrac{2}{5.3}+\dfrac{2}{7.9}+\dfrac{2}{9.11}+\dfrac{2}{11.13}+\dfrac{2}{13.15}\)
Bài 2. Tìm x, biết
x:\(3\dfrac{1}{15}=1\dfrac{1}{12}\)
\(\dfrac{3}{4}.x=27\)
\(x.\dfrac{1}{4}=\dfrac{5}{8}.\dfrac{2}{3}\)
\(\left(x+\dfrac{1}{4}\right):\dfrac{3}{7}=\dfrac{1}{6}\)
\(\dfrac{3}{4}-2.|2x-\dfrac{2}{3}|=2\)
\(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{2}\)