(x + 3)(x + 4)(x + 5) = x
<=> (x2 + 3x + 4x + 12)(x + 5) - x = 0
<=> (x2 + 7x + 12)(x + 5) - x = 0
<=> x3 + 7x2 + 12x + 5x2 + 35x + 60 - x = 0
<=> x3 + 12x2 + 46x + 60 = 0
<=> x3 + 6x2 + 6x2 + 36x + 10x + 60 = 0
<=> (x + 6)(x2 + 6x + 10) = 0
<=> (x + 6)[(x + 3)2 + 1] = 0
=> x + 6 = 0 => x = -6
a\(8\left(x+\dfrac{1}{x}\right)^{2^{ }}+4\left(x^{2^{ }}+\dfrac{1}{x^2}\right)-4\left(x^2+\dfrac{1}{x^2}\right)\left(x+\dfrac{1}{x}\right)=\left(x+4\right)^2\)giải các phương trình\(\dfrac{x+4}{2x^2-5x+2}+\dfrac{x+1}{2x^2-7x+3}=\dfrac{2x+5}{2x^2-7x+3}\)
giải phương trình :
\(\dfrac{x-5}{x-5}+\dfrac{x-6}{x-5}+\dfrac{x-7}{x-5}...\dfrac{1}{x-5}=4\)
(xϵN)
giải phương trình :
a)\(\left(x-4\right)\left(x-5\right)\left(x-6\right)\left(x-7\right)=1680\)
b)\(\left(x+2\right)\left(x+3\right)\left(x-5\right)\left(x-6\right)=180\)
Giải bất phương trình :
a)\(\left|1-x\right|+\left|2x-1\right|>5\)
b)\(\dfrac{2x+\dfrac{3x-4}{5}}{15}< \dfrac{\dfrac{3-x}{2}+7x}{5}+1-x\)
giải phương trình :
a) \(\dfrac{x+2}{x+1}+\dfrac{3}{x-2}=\dfrac{3}{x^2-x-2}+1\)
b)\(\dfrac{x+6}{x-5}+\dfrac{x-5}{x+6}=\dfrac{2x^2+23x+61}{x^2+x-30}\)
Giải phương trình sau: \(\dfrac{x+1}{65} + \dfrac{x+3}{63} = \dfrac{x+5}{61} + \dfrac{x+7}{59}\)
Giải phương trình:
a)\(\dfrac{1}{x+1}-\dfrac{5}{x-2}=\dfrac{15}{\left(x+1\right)\left(2-x\right)}\)
b) \(1+\dfrac{x}{3-x}=\dfrac{5x}{\left(x+2\right)\left(3-x\right)}+\dfrac{2}{x+2}\)
c)\(\dfrac{6}{x-1}-\dfrac{4}{x-3}=\dfrac{8}{\left(x-1\right)\left(3-x\right)}\)
d) \(\dfrac{x+2}{x-2}-\dfrac{1}{x}=\dfrac{2}{x\left(x-2\right)}\)
1. Tìm x
a.( 8x-3)*(3x+2)-(4x+7)*(x+4)=(4x+1)*(5x-1).
b.2x2+3*(x-1)*(x+1)=5x*(x+1).
c.(8+5x)*(x+2)+4*(x-2)*(x+1)+2(x-2)*(x+2)=6.
d.4*(x-1)*(x+5)-(x+2)*(x+5)=3*(x-1)*(x+2).
Mong các bạn giải nhanh giùm mình :D
Giải phương trình
\(x.\frac{3-x}{x+1}. \left(x+\frac{3-x}{x+1}\right)=2\)
