`[8x+2]/[x-3]=4` `ĐK: x ne 3`
`=>8x+2=4(x-3)`
`<=>8x+2=4x-12`
`<=>4x=-14`
`<=>x=-7/2` (t/m)
`[8x+2]/[x-3]=4` `ĐK: x ne 3`
`=>8x+2=4(x-3)`
`<=>8x+2=4x-12`
`<=>4x=-14`
`<=>x=-7/2` (t/m)
C7:
a) x^2 -1 phần 3 =2(x+1)
b) 3 phần x-2 +7 phần x+2 =8x phần x^2-4
\(\frac{4}{-25x^2+20x-3}=\frac{3}{5x-1}-\frac{2}{5x-3}\)
\(\frac{1}{x^2-3x+2}+\frac{1}{x^2-5x+6}-\frac{2}{x^2-4x+3}=0\)
\(\frac{x-1}{2x^2-4x}-\frac{7}{8x}=\frac{5-x}{4x^2-8x}-\frac{1}{8x-16}\)
\(\frac{1}{x^2+9x+20}+\frac{1}{x^2+11x+30}+\frac{1}{x^2+13x+42}=\frac{1}{18}\)
5.c) \(\dfrac{x+1}{x^2+x+1}-\dfrac{x-1}{x^2-x-1}=\dfrac{3}{x\left(x^4+x^2+1\right)}\)
6.b) \(\dfrac{4}{2x^3+3x^2-8x-12}-\dfrac{1}{x^2-4}-\dfrac{4}{2x^2+7x+6}+\dfrac{1}{2x+3}=0\)
Giải pt
\(\dfrac{x^2+2x}{x+1}+\dfrac{x^2+8x+20}{x+4}=\dfrac{x^2+4x+6}{x+2}+\dfrac{x^2+6x+12}{x+3}\)
Giải các PT sau:
a,(2x+1)(x^2+2)=0
b,(x^2+4)(7x-3)=0
c,(x^2+x+1)(6-2x)=0
d,(8x-4)(X^2+2x+2)=0
23) \(\dfrac{1}{x^2+4x+3}+\dfrac{1}{x^2+8x+15}+\dfrac{1}{x^2+12x+35}=\dfrac{1}{9}\)
24) \(\dfrac{1}{x^2+5x+6}+\dfrac{1}{x^2+7x+12}+\dfrac{1}{x^2+9x+20}+\dfrac{1}{x^2+11x+30}=\dfrac{1}{8}\)
25) \(\dfrac{x^2+2x+2}{x+1}+\dfrac{x^2+8x+20}{x+4}=\dfrac{x^2+4x+6}{x+2}+\dfrac{x^2+6x+12}{x+3}\)
7x+8/21 - x+4/8x-11 = x/3
giải phương trình
a)(x+3)^2-(x-3)^2=6x+18
b)x+3 phần x-2=5 phần (x-2)(3-x)
c)12x^2+30x-21 phần 16x^2-9
-3x-7 phần 3-4x =6x+5 phần 4x+3
d)4 phần x+1-2 phần x-2=x+3 phần x^2-x-2
giải phương trình (đoán nghiệm)
a) (x-1)3+x3+(x+1)3=(x+2)3
b) -3x4+203+35x2-10+3=0
c) x5=x4+x3+x2+x+2
d) x2-5x2+8x-4=0