Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Sửa đề : \(\frac{3}{4}x-\frac{1}{4}=2\left(x-3\right)-\frac{1}{4}x\)
\(\frac{3}{4}x-\frac{1}{4}=2x-6-\frac{1}{4}x\)
\(\frac{3}{4}x-\frac{1}{4}=\frac{7}{4}x+2x\)
\(-x-\frac{1}{4}=2x\)
\(-x-\frac{1}{4}-2x=0\)
\(-3x-\frac{1}{4}=0\)
\(-3x=\frac{1}{4}\Leftrightarrow x=-\frac{1}{12}\)
\(\Leftrightarrow\frac{3}{4}x-\frac{1}{4}=2x-6+\frac{1}{4}x\)
\(\Leftrightarrow\frac{3}{4}x-2x-\frac{1}{4}x=-6+\frac{1}{4}\)
\(\Leftrightarrow\frac{-3}{2}x=\frac{-23}{4}\)
\(\Leftrightarrow x=\frac{23}{6}\)
Ta có:
3/4x-1/4=2(x-3)+1/4x
<=>3/4x-1/4x=2x-6+1/4
<=>x-2x=-23/4
<=>-x=-23/4
<=>x=23/4.
Vậy x=23/4
g)\(=>\left[{}\begin{matrix}4x-5=0\\\dfrac{5}{4}x-2=0\end{matrix}\right.=>\left[{}\begin{matrix}4x=5\\\dfrac{5}{4}x=2\end{matrix}\right.=>\left[{}\begin{matrix}x=\dfrac{5}{4}\\x=\dfrac{8}{5}\end{matrix}\right.\)
h)
\(=>\left(2x+\dfrac{1}{2}\right)^2=\dfrac{1}{4}=>\left[{}\begin{matrix}2x+\dfrac{1}{2}=\dfrac{1}{2}\\2x+\dfrac{1}{2}=-\dfrac{1}{2}\end{matrix}\right.\)
\(=>\left[{}\begin{matrix}2x=0\\2x=-1\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x=-\dfrac{1}{2}\end{matrix}\right.\)
1)8(4x-3)-3(2-3x)=13-40x
(32x-24)-(6-9x)=13-40x
32x-24-6+9x=13-40x
41x-30=13-40x
41x+40x=13+30
81x=43
x=43/81
Vậy x=43/81
2)10x-5(1-4x)=5x-11
10x-(5-20x)=5x-11
10x-5+20x=5x-11
30x-5=5x-11
30x-5x=5-11
25x=-6
x=-6/25
Vậy x=-6/25
2: 12-10x=25-30x
=>20x=13
=>x=13/20
3: \(3\left(2x+3\right)-2\left(4x-5\right)=10x+21\)
=>6x+9-8x+10=10x+21
=>10x+21=-2x+19
=>12x=-2
=>x=-1/6
4: \(\Leftrightarrow25x-15-6x+12=11-5x\)
=>19x-3=11-5x
=>24x=14
=>x=7/12
5: \(\Leftrightarrow8-12x-5+10x=4-6x\)
=>4-6x=-2x+3
=>-4x=-1
=>x=1/4
6: \(\Leftrightarrow32x-24-6+9x=13-40x\)
=>41x-30=13-40x
=>81x=43
=>x=43/81
7: \(\Leftrightarrow10x-5+20x=5x-11\)
=>30x-5=5x-11
=>25x=-6
=>x=-6/25
Đề là tìm x hay chứng minh z
(4x - 1)2 = (1 - 4x)4
<=> 16x2 - 8x + 1 = 1 - 16x + 96x2 - 256x3 + 256x4
<=> 1 - 16x + 96x2 - 256x3 + 256x4 = 16x + 8x + 1
<=> 1 - 16x + 96x2 - 256x3 + 256x4 - 1 = 16x - 8x
<=> -16x + 96x2 - 256x3 + 256x4 = 16x - 8x
<=> -16x + 96x2 - 256x3 + 256x4 + 8x = 16x
<=> 256x4 - 256x3 + 96x2 - 8x - 16x = 0
<=> 256x4 - 256x3 + 80x2 - 8 = 0
<=> 8x(2x - 1)(4x - 1)2 = 0
<=> x = 0 hoặc 2x - 1 = 0 hoặc 4x - 1 = 0
2x = 0 + 1 4x = 0 + 1
2x = 1 4x = 1
x = 1/2 x = 1/4
=> x = 0 hoặc x = 1/2 hoặc x = 1/4