A=x+6x^2+7x^2-6x+1
A=(x^2)^2+2x^2.3x+9x^2-1x^2-6x+7
A=(x^2+3x)^2-2.(x^2+3x).1+1
A=(x^2+3x)^2>=0 với mọi x khi x^2=3x-1=0
Giải phương trình
1) 16-8x=0
2) 7x+14=0
3) 5-2x=0
4) 3x-5=7
5) 8-3x=6
6) 8=11x+6
7)-9+2x=0
8) 7x+2=0
9) 5x-6=6+2x
10) 10+2x=3x-7
11) 5x-3=16-8x
12)-7-5x=8+9x
13) 18-5x=7+3x
14) 9-7x=-4x+3
15) 11-11x=21-5x
16) 2(-7+3x)=5-(x+2)
17) 5(8+3x)+2(3x-8)=0
18) 3(2x-1)-3x+1=0
19)-4(x-3)=6x+(x-3)
20)-5-(x+3)=2-5x
Bài 1 : Phân tích các đa thức thành nhân tử
A) 2x^ - x - 2y^ - y
B) x^ + y^ - z^ - 2xy
C) (6x + 1 )^ - (6x - 1) - (1 + 6x) (6x - 1)
Bài 2 : Thực hiện phép tính
A) 4/x+2 + 2/x+2 + 5x-6/ 4-x^
B) 1 - 3x / 2x + 3x-2/2x-1 + 3x - 2 /2x-4x^
C) 1/3x-2 + 1/3x+2 - 3x-6/4-9x^
D) 1/x^-x+1 + 1 -x^ + 2/x3 + 1
Giải nhanh hộ em với ạ , tks
a) (4x-10)(24+3x)=0
b)7x-21+x(x-3)=0
c)x^2-1=2x(x+1)
a,\(\left(x+1\right)^2\left(x+2\right)+\left(x+1\right)^2\left(x-2\right)=-24\)
b, \(2x^3+3x^2+6x+5=0\)
c, \(\dfrac{3x-1}{x-1}+\dfrac{2x+5}{x+3}+\dfrac{4}{x^2+2x-3}=1\)
d, \(\dfrac{12x+1}{6x-2}-\dfrac{9x-5}{3x+1}=\dfrac{108x-36x^2-9}{4\left(9x^2-1\right)}\)
1) x2 - x - (3x - 3) = 02) x(x - 6) - 7x + 42 = 0
3) x3 - 3x2 + 3x - 1 = 0
4) (2x - 5)2 - (x + 2) 2 = 0
5) x(2x - 9) = 3x(x - 5)
Giải các phương trình sau:
a, x^2 + (x+2)(11x-7)=4
b, x^4+3x^2-4=0
c,(x-7)(x-5)(x-4)(x-2)=72
d, x(x+1)(x-1)(x+2)=4
e, 5x^3+6x^2+12x+8=0
BT. GCPT sau :
a) 7x + 21 = 0
b) 5x - 2 = 0
c) 12 - 6x =0
d) -2x + 14 = 0
Giups mk vs . thank m.n
bài 1
a \(\frac{3x}{x-2}-\frac{x}{x-5}+\frac{2x^2}{7x-10-x^2}\)=0
b\(\frac{2x+5}{x+3}-\frac{2x+2}{\left(x-1\right)\left(x+3\right)}=\frac{3x-1}{x-1}\)
c (2x-1)\(^2\)- (2x+1)\(^2\)=4(x-3)