l x l < 3 ⇒ l x l ϵ { 0 ; 1 ; 2 }
⇒ x ∈ { 0 ; 1 ; 2 ; -1 ; -2 }
Vì /x/ < 3 \(\Rightarrow\) /x/ \(\in\) {1;2;0}
x = { 1; 2; (-1);(-2) }
tìm x, biết:
e) \(\dfrac{2}{7-x}\)=\(\dfrac{18}{45}\) f)\(\dfrac{2x+3}{3}\)=\(\dfrac{50}{15}\) g)\(2\dfrac{x}{7}\)=\(\dfrac{75}{35}\) h)\(2\dfrac{3}{x}\)=\(\dfrac{13}{x}\)(x khác 0)
2 tìm x
a) x+25=40
b) 198-(x+4)=120
c) (2x-7).3=125
d) x +16⋮x+1
bài 45: Tìm x, biết:
a) x=\(\dfrac{-1}{2}+\dfrac{3}{4}\); b) \(\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{-19}{30}\)
Tìm \(x\), biết :
a) \(x=\dfrac{1}{4}+\dfrac{2}{13}\)
b) \(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
Tìm \(x\) biết :
a) \(x=\dfrac{-1}{2}+\dfrac{3}{4}\)
b) \(\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{-19}{30}\)
\(\dfrac{x+2}{7}\)=\(\dfrac{-36}{28}\)
tìm x:
tìm x thuộc số nguyên biết
a) (x-4) (x+3) =0 b)(x-3) (x-5) <0 c) (x-3)^2014 =(x-3)^2016
Tìm X
Tìm X
Tìm X
