Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(\Leftrightarrow2x^2=72\)
\(\Leftrightarrow x^2=36\)
\(\Leftrightarrow x=\pm6\)
Vậy ...
\(b,\Leftrightarrow\dfrac{3}{5}x-0,75=2\dfrac{4}{5}.\dfrac{3}{7}=\dfrac{6}{5}\)
\(\Leftrightarrow\dfrac{3}{5}x=\dfrac{6}{5}+0,75=\dfrac{39}{20}\)
\(\Leftrightarrow x=\dfrac{39}{20}:\dfrac{3}{5}=\dfrac{13}{4}\)
Vậy ...
\(c,\Leftrightarrow2x=1\dfrac{5}{6}.\dfrac{6}{11}-\dfrac{3}{10}=\dfrac{7}{10}\)
\(\Leftrightarrow x=\dfrac{7}{10}:2=\dfrac{7}{20}\)
Vậy ...
\(d,\Leftrightarrow\dfrac{1}{x-7\dfrac{1}{3}}=1.5:2\dfrac{1}{4}=\dfrac{2}{3}\)
\(\Leftrightarrow x-7\dfrac{1}{3}=\dfrac{3}{2}\)
\(\Leftrightarrow x=\dfrac{3}{2}+7\dfrac{1}{3}=\dfrac{53}{6}\)
Vậy ...
a) 2x2 - 72 = 0
\(\Rightarrow\) 2x2 = 72
\(\Rightarrow\) x2 = 36 = 62 = (- 6)2
\(\Rightarrow\) x = 6 hoặc x = - 6
Vậy x = 6 hoặc x = - 6
b) (\(\dfrac{3}{5}\)x - 0,75) : \(\dfrac{3}{7}\) = \(2\dfrac{4}{5}\)
\(\Rightarrow\) (\(\dfrac{3}{5}\)x - 0,75) : \(\dfrac{3}{7}\) = \(\dfrac{14}{5}\)
\(\Rightarrow\) \(\dfrac{3}{5}\)x - \(\dfrac{3}{4}\) = \(\dfrac{6}{5}\)
\(\Rightarrow\) \(\dfrac{3}{5}\)x = \(\dfrac{39}{20}\)
\(\Rightarrow\) x = \(\dfrac{13}{4}\)
Vậy x = \(\dfrac{13}{4}\)
a) \(\left(x+1,5\right):3\dfrac{1}{5}=\dfrac{-5}{8}\\ \left(x+\dfrac{3}{2}\right):\dfrac{16}{5}=\dfrac{-5}{8}\\ x+\dfrac{3}{2}=\dfrac{-5}{8}.\dfrac{16}{5}\\ x+\dfrac{3}{2}=-2\\ x=-2-\dfrac{3}{2}\\ x=\dfrac{-4}{2}-\dfrac{3}{2}\\ x=\dfrac{-7}{2}\)
1, CÓ( X+1,5)8 VÀ (2,7 -Y)12> HOẶC = 0
MÀ (X+1,5)8 + (2,7-Y)12 =0
SUY RA \(\hept{\begin{cases}X+1,5=0\\2,7-Y=0\end{cases}}\)
SUY RA\(\hept{\begin{cases}X=-1,5\\Y=2,7\end{cases}}\)
\(\left(3x-1,5\right).\left(\frac{-1}{2}x+5\right)=0\)
\(\Leftrightarrow-\frac{3}{2}x^2+15x+\frac{3}{4}x-\frac{15}{2}=0\)
\(\Leftrightarrow-\frac{3}{2}x^2+\frac{63}{4}x-\frac{15}{2}=0\)
\(\Leftrightarrow-6x^2+63x-30=0\)
\(\Leftrightarrow2x^2-21x+10=0\)
\(\Leftrightarrow2x^2-20x-x+10=0\)
\(\Leftrightarrow2x\left(x-10\right)-\left(x-10\right)=0\)
\(\Leftrightarrow\left(x-10\right)\left(2x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-10=0\\2x-1=0\end{cases}}\) \(\orbr{\begin{cases}x=10\\x=\frac{1}{2}\end{cases}}\)
#Chúc bạn học tốt!
1-|x+1,5|=0
|x+1,5|=1-0
|x+1,5|=0=> x+1,5=1 hoặc x+1,5=-1
x=1-1,5 x=-1-1,5
x=-0,5 x=-2,5
1-|x+1,5|=0
|x+1,5|=1-0
...........=1
=>x+1,5€{1,-1)
=>X€{-0,5;-2,5)
a: x=2/3-4/5=10/15-12/15=-2/15
b: 1/2-x=7/12
=>x=1/2-7/12=-1/12
c: =>7/2:x=-7/2
=>x=-1
d: =>1/6x=3/8-5/2=3/8-20/8=-17/8
=>x=-17/8*6=-102/8=-51/4
e: =>1,5x=-1,5
=>x=-1
Ta có: \(\left(3x-1.5\right)\left(\dfrac{-1}{2}x+5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}3x-1.5=0\\\dfrac{-1}{2}x+5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x=1.5\\\dfrac{-1}{2}x=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=10\end{matrix}\right.\)
Vậy: \(x\in\left\{\dfrac{1}{2};10\right\}\)
Giải:
(3.x-1.5).(-1/2.x+5)=0
=> 3x-1.5=0 hoặc -1/2x+5=0
x=1/2 hoặc x=10
Vậy x ∈{1/2;10}
Chúc bạn học tốt!