\(x\left(x+6\right)-7x-42=0\)
\(\Leftrightarrow x\left(x+6\right)-7\left(x+6\right)=0\)
\(\Leftrightarrow\left(x-7\right)\left(x+6\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-7=0\\x+6=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-6\end{cases}}}\)
tìm x
a) \(x\left(x-5\right)-4x+20=0\)
b) \(x\left(x+6\right)-7x-42=0\)
c) \(x^3-5x^2+x-5=0\)
Tìm x biết
1. \(\left(2x-3\right)^2=\left(x+5\right)^2\)
2. \(x^2\left(x-1\right)-4x^2+8x-4=0\)
3. \(x^2+7x+12=0\)
4. \(x^2+3x-18=0\)
5. \(x\left(x+6\right)-7x-42=0\)
bài 1 giải các phương trình sau:
h,\(\left(\dfrac{3}{4}x-1\right)\left(\dfrac{5}{3}x+2\right)=0\)
bài 2 giải các phương trình sau:
b,3x-15=2x(x-5) m,(1-x)(5x+3)=(3x-7)(x-1)
d,x(x+6)-7x-42=0 p,\(\left(2x-1\right)^2-4=0\)
f,\(x^3+2x^2-\left(x-2\right)=0\) r,\(\left(2x-1\right)^2=49\)
h,(3x-1)(6x+1)=(x+7)(3x-1) t,\(\left(5x-3\right)^2-\left(4x-7\right)^2=0\)
j,\(\left(2x-5\right)^2-\left(x+2\right)^2=0\) u,\(x^2-10x+16=0\)
w,\(x^2-x-12=0\)
Tìm x biết:
\(\left(x+1\right)^2=x+1\)
\(x\left(x-5\right)^2-4x+20=0\)
\(x\left(x+6\right)-7x-42=0\)
\(x^3-5x^2+x-5=0\)
\(x^4-2x^3+10x^2-20x=0\)
Giúp mình vs nha
Tìm x :
a) \(\frac{3x+2}{2}-\frac{3x+1}{6}=2x+\frac{5}{3}\)
b) \(\frac{x+1}{x-2}+\frac{x-1}{x+2}=\frac{2\left(x^2+2\right)}{x^2-4}\)
c) \(\left(2x+3\right)\left(\frac{3x+8}{2-7x}+1\right)=\left(x-5\right)\left(\frac{3x+8}{2-7x}+1\right)\)
d) \(\left(x+1\right)^2-4\left(x^2-2x+1\right)=0\)
Tìm x để phân thức bằng 0:
\(\frac{\left(x^2-7x+12\right)^2-\left(x-3\right)^2}{\left(x-3\right)^4-\left(x-3\right)^2}\)
Giải phương trình
\(\left(x^2+x+1\right)\left(6-2x\right)=0\)
\(\left(8x-4\right)\left(x^2+2x+2\right)=0\)
\(x^3-7x+6=0\)
\(x^5-5x^3+4x=0\)
tìm x biết \(\left(2x-2012\right)+\left(5x-2013\right)+\left(4025-7x\right)=0\)0
1.\(\left(x-5\right)^2+3\left(x-5\right)=0\)
\(2,\dfrac{2x-1}{3}-\dfrac{5x+2}{7}=x+13\)
\(3,\dfrac{x-1}{x+2}-\dfrac{x}{x-2}=\dfrac{7x-6}{4-x^2}\)
