b) \(x^5+x+1=x^5-x^2+x^2+x+1=x^2\left(x^3-1\right)+x^2+x+1=x^2\left(x-1\right)\left(x^2+x+1\right)+x^2+x+1=\left(x^2+x+1\right)\left[x^2\left(x-1\right)+1\right]\)
Giải các phương trình sau
a) 17x + 15(x-1) = 1 - 14(3x+1)
b) 2x(x+5) - (x-3)2 = x2 + 6
c) (4x +7)(x-5) - 3x2 = x(x-1)
d) 6(x-3) + (x-1)2 - (x+1)2 = 2x
Giải các pt sau:
a)\(\frac{\left(2x+1\right)^2}{5}-\frac{\left(x-1\right)^2}{3}=\frac{7x^2-14x-5}{15}\)
b)\(\frac{201-x}{99}+\frac{203-x}{97}=\frac{205-x}{95}+3=0\)
c)\(x^3+x^2+x+1=0\)
d)(x-1)x(x+1)(x+2)=24
e)\(\left(5x-3\right)^2-\left(4x-7\right)^2=0\)
f)\(3x^2+2x-1=0\)
g)\(x^2+6x-16=0\)
h)\(x^2+3x-10=0\)
i)\(x^2+x-2=0\)
k)\(3x^2+7x+2=0\)
l)\(4x^2-12x+5=0\)
Bài 1
a) 6x3 - 3x = -7x2
b) 2x3+ x2 - x+3 =0
c) (x-5) (x-6) (x+2) (x+3)= 180
d) (x+1) (2x+1) (4x+3)2 = 810
e) (x+10) (x+12) (x+15) (x+18)= 2x2
Giải phương trình
a/ 2x-1 trên 4 + x-3 trên 3 = 4x-2 trên 3 - 6x+7 trên 12 .
b/ (x+3)(4-x)= x² +6x + 9
c/ 96 trên x ² -4 + 7+x trên 4-x = 2x-1trên x+4 -3
d/ 1 + x-2 trên 1-x + 2x² - 5 trên x³ - 1 = 4 trên x² + x + 1
d/ 1+x-2 trên 1-x + 2x ² -5 trên x mũ 3 - 1
giải phương trình:
a,|x|-1/4-1/8(|x|-5/4-a4-2|x|)=|x|-9/2-7/8 f,|2x-x^2-1|=2x-x^2-1 m,|x-2|+|x-3|+|2x-8|=9
b,7x+5/5-x=|3x-5|/2 g,|x^2-3x+3|=3x-x^2-1
c,x-|3x-2|/5=3-2x-5/3 h,|x+1|-|2-x|=0
d,x^2-|x|=6 i,|x|-|x-2|=2
e,|x^2-4|=x^2-4 k,|x-1|+|x-2|=1
Bài 3:
a) \(\dfrac{2x-1}{5}\)-\(\dfrac{x-2}{3}\)
=\(\dfrac{x+7}{15}\)
b) \(\dfrac{x+3}{2}\)-\(\dfrac{x-1}{3}\)
=\(\dfrac{x+5}{6}\)+1
c) \(\dfrac{2\left(x+5\right)}{3}\)+\(\dfrac{x+12}{2}\)
-\(\dfrac{5\left(x-2\right)}{6}\)=\(\dfrac{x}{3}\)+11
d) \(\dfrac{x-4}{5}\)+\(\dfrac{3x-2}{10}\)-x
=\(\dfrac{2x-5}{3}\)-\(\dfrac{7x+2}{6}\)
e) \(\dfrac{\left(2x-3\right)\left(2x+3\right)}{8}\)
=\(\dfrac{\left(x-4^{ }\right)^2}{6}\)+\(\dfrac{\left(x-2\right)^2}{3}\)
d) \(\dfrac{7x^2-14x-5}{15}\)
=\(\dfrac{\left(2x+1\right)^2}{5}\)-\(\dfrac{\left(x-1\right)^2}{3}\)
e) \(\dfrac{\left(7x+1\right)\left(x-2\right)}{10}\)+\(\dfrac{2}{5}\)
=\(\dfrac{\left(x-2\right)^2}{5}\)+\(\dfrac{\left(x-1\right)\left(x-3\right)}{2}\)
1) (x + 1)² + 2x = x(x + 1) + 6
2) 3 - 4x(3 - 2x) = 8x² + x - 30
3) x²-x(5 - x) = 8
4) (x - 1)² - 36 = 0
5) (3x - 1)(4x - 3) + 2x(6x - 1) = 2(2x + 7)
giải giúp hết với
câu 1. giải phương trình
a) 4.(x+5).(x+6).(x+10).(x+12) = \(3x^2\)
b) (x+1).(x+2).(x+3).(x+6) = \(120x^2\)
c) (x+2).(x+3).(x+8).(x+12) = \(4x^2\)
d) (x-4).(x-5).(x-8).(x-10) = \(72x^2\)
e) (x+1).(x+3).(x+5).(x+15) = \(-16x^2\)
f) (\(2x^2\) - 3x + 1).(\(2x^2\) + 5x + 1) = \(9x^2\)
