(4x - 1)(2x2 - 3x + 2) \(=8x^3-12x^2+8x-2x^2+3x-2\) \(=8x^3-14x^2+11x-2\)
=8x^3-12x^2+8x-2x^2+3x-2
=8x^3-14x^2+11x-2
1, a, l 4+2x l = -4x
b, l3x-1l + 2 = x
c) l x+15l +1 = 3x
d, l 2x-5 l +x = 2
2, a, l 2x - 5 l = x+1
b, l 3x -2 l -1 + x
c) l 3x -7l = 2x +1
d, l2x -1l +1 = x
Giúp vs ạ, cần trước 5 h chiều
I) Tìm x biết:
1)
a, l \(\frac{1}{2}x\)l =3 - 2x
b, lx-1l = 3x + 2
c) l 5xl =x - 12
d) l 17-x l =5x+1
2)
a, l 9+x l =2x
b) l 5xl -3x =2
c) lx+6l - 9 =2x
d, l 2x-3 l +x =21
3,
a, l 4+2x l = -4x
b, l3x-1l + 2 = x
c) l x+15l +1 = 3x
d, l 2x-5 l +x = 2
4,
a, l 2x - 5 l = x+1
b, l 3x -2 l -1 + x
c) l 3x -7l = 2x +1
d, l2x -1l +1 = x
1) \(\left|3x+2\right|=\left|x+1\right|\)
2) \(\left|\left(x+2\right)\times x\right|=\left|x+2\right|\)
3) \(\left|2x+3\right|=x+1\)
4) \(\left|4x+5\right|+3.x=7\)
Cho các đa thức :
F(x)=x^3.(3x-1)-x(1+3x^4)
G(x)=x^2(x^2+2)-x(x^4+2x^2+7)+3
H(x)=x^3(-2+2x-x^2)-1/2(5x-3-2x^2)
a) Tính F(x)+G(x)-H(x)=A(x)
F(x)-G(x)-H(x)=B(x)
F(x)+G(x)-2H(x)=C(x)
b) Tìm nghiệm của C(x)
a)1/2x+3/5x=-33/22
b) (2/3x -4/7).(1/2+-3/7:x)=0
c) (4/5-2x).(1/3+3/5:x)=0
Tìm x biết: |(x+3)(2x-1)|+|4x^2-1|=0
\(^{\dfrac{-7}{1+2x}}=\dfrac{5}{2-3x}\)
1, Tìm x, biết
a, (2x+3).(3x-5) \(\ge\) 0
b, \(\dfrac{x}{3-x}\) > -1
c, \(\dfrac{3}{2}\) \(\le\) \(\dfrac{x-1}{x+5}\)
d, \(\dfrac{7}{4x^2-1}\) \(\ge\) 0
e, \(\dfrac{7}{x^2-3}\) > 1
tính giá trị biểu thức 4x-2/3 biết 2x-1/5=8
