(2x+3)^3-(2x-5) (4x^2+25+10x)
2) (2x+1)^3-(3x+2)^2=(2x-5)(4x^2+10x+25)+6x(2x+1)-9x^2
Tìm x
tìm x
1) (3x-2)(9x^2+6x+4)-(2x-5)(2x+5)=(3x-1)^3-(2x+3)^2+9x(3x-1)
2) (2x+1)^3-(3x+2)^2=(2x-5)(4x^2+10x+25)+6x(2x+1)-9x^2
thực hiện phép tính
\(\dfrac{1}{3x-2}-\dfrac{1}{3x+2}-\dfrac{3x-6}{9x^2-4}\)
\(\dfrac{x+25}{2x^2-50}-\dfrac{x+5}{x^2-5x}-\dfrac{5-x}{2x^2+10x}\)
\(\dfrac{1-2x}{2x}-\dfrac{4x}{2x-1}-\dfrac{3}{2x-4x^2}\)
1) rút gọn
a) (x^2-2x+2)(x^2-2)(x^2+2x+2)(x^2+2)
b) (x+1)^2-(x-1)^2+3x^3-3x(x+1)(x-1)
c) (2x+1)^2+2(4x^2-1)+(2x+1)^2
d) (3x+1)^2-2(3x+1)(3x+5)+(3x+5)^2
e) (a-b+c)^2-2(a-b+c)(c-b)+(b-c)^2
f)(2x-5)(4x^2+10x+25)(2x+5)(4x^2-10x+25)
g)(a+b)^3+(a-b)^3-2a^3
h) 100^2-99^2+98^2-97^2+....+2^2 -1
Tìm x
(2x+3)3 - (2x+5)(4x2-10x+25) = (6x-1)2 - (x-2)(x2+2x+4)
Rút gọn biểu thức: \(\left(2x-5\right)\left(4x^2+10x+25\right)\left(2x+5\right)\left(4x^2-10x+25\right)-^4\)\(64x^4\)
Tìm giá trị nhỏ nhất của các biểu thức sau:
A = \(x^2+4x+5\).
B = \(x^2+10x-1\).
C = \(5-4x+4x^2\).
D = \(x^2+y^2-2x+6y-3\).
E = \(2x^2+y^2+2xy+2x+3\).
B2 : Giải ptr :
a) \(\left(2x+5\right)^2=\left(x+2\right)^2\)
b) \(3-4x.\left(25-2x\right)=8x^2+x-300\)
c) \(\frac{x+5}{x^2-5x}-\frac{x-5}{2x^2+10x}=\frac{x+25}{2x^2-50}\)