* Tìm x:
x - 25% x = \(\frac{1}{2}\)
Tìm x:
x(x-1)(x+3)-x^2(x+3)=-4
\(\Leftrightarrow x^3+2x^2-3x-x^3-3x^2=-4\)
\(\Leftrightarrow x^2+3x-4=0\)
=>(x+4)(x-1)=0
=>x=-4 hoặc x=1
Tìm X:x/2+x-1/3+x-2/4=1/4
Tìm x:x+1/2=8/x+1
\(\frac{x+1}{2}=\frac{8}{x+1}\Rightarrow\left(x+1\right)^2=8.2\)
=>(x+1)2=16
=>x+1=\(\sqrt{16}\)
=>x+1=4
=>x=3
Tìm x:
x - 1/8 = 1/4 x 2/3
`x-1/8=1/4xx2/3`
`x-1/8=1/6`
`x=1/6+1/8`
`x=7/24`
x - 1/8 = 1/4 x 2/3
x - 1/8= 1/6
x = 1/6 + 1/8
x = 14/48
tìm x:
X:1/3=1/2+1/3 (X:2/3):2/5=7/10
x : 1/3 = 1/2 +1/3
=>x:1/3=5/6
=>x=5/6 x 1/3
=>x=5/18
(x:2/3):2/5=7/10
=>x:2/3=7/10 x 2/5
=>x:2/3=7/25
=>x=7/25x2/3
=>x=14/75
CHÚC BẠN HỌC TỐT
tìm x:
X:1/3=1/2+1/3 (X:2/3):2/5=7/10
x:1/3=1/2+1/3
x:1/3=5/6
x =5/6.1/3
x =5/18
(x:2/3):2/5=7/10
x:2/3 =7/10.2/5
x:2/3 =7/25
x:2/3 =7/25.2/3
x:2/3 =14/75
Tìm số nguyên x:x+(x+1)+(x+2)+...+19+20=20
\(x+\left(x+1\right)+\left(x+2\right)+...+19+20=20\)
\(\Leftrightarrow x+\left(x+1\right)+\left(x+2\right)+...+19=0\)
\(\Leftrightarrow\frac{x\left(19+x\right)}{2}=0\)
\(\Leftrightarrow x\left(x+19\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x+19=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x=-19\end{cases}}\)
Mà \(x\ne0\)nên \(x=-19\)
tìm x:
X:1/3=1/2+1/3 (X:2/3):2/5=7/10
Giúp cháuuuuuu!!!!
1) \(x:\dfrac{1}{3}=\dfrac{1}{2}+\dfrac{1}{3}\)
\(\Rightarrow3\times x=\dfrac{5}{6}\Rightarrow x=\dfrac{5}{18}\)
2) \(\left(x:\dfrac{2}{3}\right):\dfrac{2}{5}=\dfrac{7}{10}\)
\(\Rightarrow\dfrac{3}{2}\times x=\dfrac{7}{10}\times\dfrac{2}{5}=\dfrac{7}{25}\)
\(\Rightarrow x=\dfrac{7}{25}:\dfrac{3}{2}=\dfrac{14}{75}\)
X : 1/3 = 1/2 + 1/3
X = 5/18
( X : 2/3 ) : 2/5 = 7/10
X = 14/75
B1,Giải pt
a,X^2+x+4/2. + x^2+x+7/3.=x^2+x+13/5. + x^2+x+16/6
b,2/x^2+4x+3. + 5/x^2+11x+24. + 2/x^2+18x+80=9/25
B2,Cho pt ẩn x:x+m/x+3 +x-3/x-1=2 tìm các giá trị của tham số m để x=2
Tìm x:x-\(\frac{x}{3}\)=\(\frac{3}{57}\):\(\frac{12}{19}\)
\(x-\frac{x}{3}=\frac{3}{57}:\frac{12}{19}\)
\(x-\frac{x}{3}=\frac{3}{57}\times\frac{19}{12}\)
\(x-\frac{x}{3}=\frac{1}{12}\)
\(\Rightarrow12x-4x=1\)
\(\Rightarrow8x=1\)
\(\Rightarrow x=\frac{1}{8}\)