x12+x6+1=x12+x9-x9+3x6-2x6+x3-x3+1
=x12+x9+x6-x9-x6-x3+x6+x3+1
=x6(x6+x3+1)-x3(x6+x3+1)+1(x6+x3+1)
=(x6-x3+1)(x6+x3+1)
x12+x6+1=x12+x9-x9+3x6-2x6+x3-x3+1
=x12+x9+x6-x9-x6-x3+x6+x3+1
=x6(x6+x3+1)-x3(x6+x3+1)+1(x6+x3+1)
=(x6-x3+1)(x6+x3+1)
Mọi người check xem đúng không:
<=>x(3x+2)+(x+1)^2 - (2x - 5)(2x+5)= -12
<=>3x^2 + 2x + (x+1)^2 - 2x^2 - 5^2= -12
<=>(3x^2 - 2x^2) + [ (x +1)^2 -5^2] + 2x = -12
<=>(3x - 2x)(3x + 2x)+ (x+1-5) (x+1+5) + 2x = -12
=> 3x - 2x = -12 ; 3x+2x = -12 ; x+1+5 = -12 ; x+1-5 = -12 hoặc 2x = -12
=> x = -12 ; 5x =-12 ; x+ 6 = -12 ; x -4 = -12 hoặc x = -12: 2
=> x= -12 ; x = -12:5; x = -12 :6; x = -12 + 4 hoặc x= -6
=> x= -12 x = -12/5; x = -2 ; x = -8 hoặc x = -6
Mọi người check xem đúng không:
<=>x(3x+2)+(x+1)^2 - (2x - 5)(2x+5)= -12
<=>3x^2 + 2x + (x+1)^2 - 2x^2 - 5^2= -12
<=>(3x^2 - 2x^2) + [ (x +1)^2 -5^2] + 2x = -12
<=>(3x - 2x)(3x + 2x)+ (x+1-5) (x+1+5) + 2x = -12
=> 3x - 2x = -12 ; 3x+2x = -12 ; x+1+5 = -12 ; x+1-5 = -12 hoặc 2x = -12
=> x = -12 ; 5x =-12 ; x+ 6 = -12 ; x -4 = -12 hoặc x = -12: 2
=> x= -12 ; x = -12:5; x = -12 :6; x = -12 + 4 hoặc x= -6
=> x= -12 x = -12/5; x = -2 ; x = -8 hoặc x = -6
1/ \(\dfrac{x+4}{4}+\dfrac{3x-7}{5}=\dfrac{7x+2}{20}\)
2/ \(\dfrac{x}{6}+\dfrac{1-3x}{9}=\dfrac{-x+1}{12}\)
3/ \(\dfrac{x-3}{3}-\dfrac{x+2}{12}=\dfrac{2x-1}{4}\)
4/ \(\dfrac{x-2}{4}-\dfrac{2x+3}{3}=\dfrac{x+6}{12}\)
5/ \(\dfrac{2x-1}{12}-\dfrac{3-x}{18}=\dfrac{-1}{36}\)
rút gọn phân thức:
\(\frac{x^{24}+x^{18}+x^{12}+x^6+1}{x^{27}+x^{24}+x^{21}+x^{18}+x^{15}+x^{12}+x^9+x^6+x^3+1}\)
Giải nghiệm phương trình 1/x(x+3) + 1/(x+3)(x+6) + 1/(x+6)(x+12) = 1/16
Giúp mình với ạ. Cảm ơn nhiều
\(\dfrac{1}{x^2-5x+6}+\dfrac{1}{x^2-7x+12}+\dfrac{1}{x^2-9x+12}+\dfrac{1}{x^2-11x+30}=\dfrac{1}{8}\)giải pt
Giúp tui với
rút gọn biểu thức x^10-x^8-x^7+x^6+x^5+x^4-x^3-x^2+1/x^30+x^24+x^18+x^12+x^6+1
Giải pt sau
\(\dfrac{1}{\text{x}^2+5x+6}\)+\(\dfrac{1}{\text{x}^2+7x+12}\)+\(\dfrac{1}{x^2+9x +12}\)+\(\dfrac{1}{\text{x}^2+9x+30}=\dfrac{1}{8}\)
x^12 +x^6 +1