\(\left(x^2-x+3\right)\left(-2x^2+3x+5\right)\)
\(=-2x^4+3x^3+5x^2+2x^3-3x^2-5x-6x^2+9x+15\)
\(=-2x^4+5x^3-4x^2+4x+15\)
\(\left(x^2-x+3\right)\left(-2x^2+3x+5\right)\)
\(=-2x^4+3x^3+5x^2+2x^3-3x^2-5x-6x^2+9x+15\)
\(=-2x^4+5x^3-4x^2+4x+15\)
a) (x2 - 2x)2 - 6x2 +12x + 9 = 0
b) (x2 + x + 1)(x2 + x + 2) = 12
c) (2x2 - 3x + 1)(2x2 + 5x + 1) - 9x2 = 0
a) (x2 - 5x)2 + 10(x2 - 5x) + 24 = 0
b) (2x + 1)2 - 2x - 1 = 2
c) x(x - 1)(x2 - x + 1) - 6 = 0
d) (x2 + 1)2 + 3x(x2 + 1) + 2x2 = 0
1) (3x - 2)(4x + 5) = 0
2) (4x + 2)(x2 + 3) = 0
3) (2x + 7)(x - 3)(5x - 1) = 0
4) x2 - 3x = 0
5) x2 - x = 0
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)
(x2-3x)2+5(x2-3x)+6=0
1)3x-1/3 = 2-x/2
2)Kiểm tra xem các giá trị sau có là nghiêm của bất phương trình : x2- 2x<3x ko?
a) x=2 b)x=1 c)x=-3 d) x=4
(2x2 + 1)(4x-3)=(2x2+1)(x-13)
giải các phương trình sau:
a. x2-25=8(5-x)
b.x-2/ x+2 - 2(x-11)/x2-4 =3/x-2
bài 2
a 0,75x (x +5 )= x+5 (3- 1,25x)
b\(\frac{4}{5}x-3=\frac{1}{5}x\left(4x-15\right)\)
c(x-3) -\(\frac{\left(x-3\right)\left(2x-5\right)}{6}=\frac{\left(x-3\right)\left(3-x\right)}{4}\)
d \(\frac{\left(3x+1\right)\left(3x-2\right)}{3}+5\left(3x+1\right)=\frac{2\left(2x+1\right)\left(3x+1\right)}{3}+2x\left(3x+1\right)\)
giải phương trình
[x - 6] [ 2x -5 ] [ 3x + 9 ] = 0
2x [ x - 3 ] + 5 [ x - 3 ] = 0
[ 4 - x ]2 - [ x - 2 ] [ 3 - 2x ] = 0
3x [x2 + 1 ] [ x - 2 ] =0
[ 3x + 5 ] [ x2 + x + 1 ] = 0