\(\dfrac{x-1}{x+5}=\dfrac{x-3}{x+4}\)
\(\Rightarrow\left(x-1\right)\left(x+4\right)=\left(x-3\right)\left(x+5\right)\)
\(\Rightarrow x\left(x+4\right)-\left(x+4\right)=x\left(x+5\right)-3\left(x+5\right)\)
\(\Rightarrow\left(x^2+4x-x\right)-4=\left(x^2+5x-3x\right)-15\)
\(\Rightarrow x^2+3x=x^2+2x-11\)
\(\Rightarrow x=-11\)
Các bạn ơi, giúp tôi bài này với, tôi đang cần gấp.
\(\left|\dfrac{3}{5}-\dfrac{1}{2}x\right|>\dfrac{2}{5}\)
Tìm x.
Cảm ơn các bạn rất nhiều.
Cần giúp nhanh vs
Bài 1. Tìm x
a) \(\left|x+\dfrac{7}{4}\right|=\dfrac{1}{2}\)
b) \(\left|2x+1\right|-\dfrac{2}{5}=\dfrac{1}{3}\)
c) \(3x.\left(x+\dfrac{2}{3}\right)=0\)
d) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)\)
Bài 2. Tính nhanh
\(A=\dfrac{1}{100}-\dfrac{1}{100.99}-\dfrac{1}{99.98}-\dfrac{1}{98.97}-....-\dfrac{1}{3.2}-\dfrac{1}{2.1}\)
Tìm x:
\(\dfrac{7}{5}\)x-\(\dfrac{2}{3}\)=\(-\dfrac{4}{3}\)x-\(\dfrac{1}{4}\)
Tìm x biết:
\(\dfrac{x-1}{2016}+\dfrac{x-2}{2015}-\dfrac{x-3}{2014}=\dfrac{x-4}{2013}\)
a)\(\dfrac{5}{2}:\dfrac{x}{6}=5:0,2\)
b)\(2\dfrac{3}{4}.x=3\dfrac{1}{7}:0.01\)
Cần gấp. Thanks mấy bạn nhìu♂♀
1,Tìm x, biết:
a/\(^{\left(x-1\right)^{x+2}}=^{\left(x-1\right)^{x+4}}\)
b/\(\dfrac{1}{4}\cdot\dfrac{2}{6}\cdot\dfrac{3}{8}\cdot\dfrac{4}{10}\cdot...\cdot\dfrac{30}{62}\cdot\dfrac{31}{64}=2x\)
c/\(4^x+3^x=2^x+6^x\left(STN\right)\)
GIÚP MÌNH NHANH NHA MÌNH TICK CHO
Bài 1: Tìm x, biết
a,\(\dfrac{1}{2}+\dfrac{2}{3}.x=\dfrac{4}{5}\)
b,\(x+\dfrac{1}{4}=\dfrac{4}{3}\)
c,\(\dfrac{3}{5}x-\dfrac{1}{2}=-\dfrac{1}{7}\)
d,\(|x-\dfrac{4}{5}|=\dfrac{3}{4}\)
e,\(\dfrac{1}{2}-lxl=\dfrac{1}{3}\)
Tìm \(x\), biết :
a) \(\dfrac{1}{4}+x=-\dfrac{1}{3}\)
b) \(-\dfrac{3}{7}+x=\dfrac{5}{8}\)
c) \(0,472-x=1,634\)
d) \(-2,12-x=1\dfrac{3}{4}\)
Tìm x, biết
a, \(\dfrac{3}{7}+\dfrac{4}{7}x=\dfrac{1}{3}\)
b, \(25-\left(5-x\right)=-7\)
c, \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
d, \(2x\left(x-\dfrac{1}{7}\right)=0\)
e, \(\left|\dfrac{1}{2}x-\dfrac{3}{4}\right|-7=-3\)
