\(\left(2x+\dfrac{1}{6}\right)\left(x-1\right)\)
\(=2x^2-2x+\dfrac{1}{6}x-\dfrac{1}{6}\)
\(=2x^2-\dfrac{11}{6}x-\dfrac{1}{6}\)
Thực hiện phép tính , rút gọn bt
\(\dfrac{2x+y}{2x^2-xy}+\dfrac{16x}{y^2-4x^2}+\dfrac{2x-y}{2x^2+xy}\)
\(\dfrac{x+y}{2\left(x-y\right)}+\dfrac{2}{x^2+3}+\dfrac{1}{x+1}\)
Rút gọn:
\(A=\left(\dfrac{1+2x}{4+2x}-\dfrac{x}{3x-6}+\dfrac{2x^2}{12-3x^2}\right)\cdot\dfrac{24-12x}{6+13x}\)
\(\dfrac{1}{2x-x^2-4}\) tìm GTLN/ GTNN
\(\dfrac{3x^2+14}{x^2+4}\)
\(\dfrac{2x+1}{x^2+2}\)
1/ Thực hiện phép nhân :
a) x2 ( 5x3 - x - \(\dfrac{1}{2}\))
b) ( 3xy - x2 + y ) \(\dfrac{2}{3}\)x2y
c) x2 ( 4x3 - 5xy + 2x ) ( -\(\dfrac{1}{2}\) xy )
2/ Tìm x, biết
a) 3x( 12x - 4 ) - 9x (4x - 3 ) = 30
b ) x( 5 - 2x ) + 2x ( x - 1 )= 15
Làm tính nhân :
a) \(3x\left(5x^2-2x-1\right)\)
b) \(\left(x^2+2xy-3\right)\left(-xy\right)\)
c) \(\dfrac{1}{2}x^2y\left(2x^3-\dfrac{2}{5}xy^2-1\right)\)
Tìm x, biết
a) 4(x+2) - 7(2x-1) + 9(3x-4) = 30
b)2(5x-8) - 3(4x-5) = 4(3x-4) + 11
c) 4x2 + 3(2x2+1) = 2x(5x-7)
d) x(x2-7) = 2x(\(\dfrac{1}{2}\)x2+6) + 8
Làm tính nhân :
a) \(x^2\left(5x^3-x-\dfrac{1}{2}\right)\)
b) \(\left(3xy-x^2+y\right)\dfrac{2}{3}x^2y\)
c) \(\left(4x^3-5xy+2x\right)\left(-\dfrac{1}{2}xy\right)\)
\(C=\left(\dfrac{2x-3}{4x^2-12x+5}+\dfrac{3}{1-2x}-\dfrac{2x-8}{2x^2-13x+20}\right):\dfrac{21+2x-8x^2}{4x^2-3+4x}+1\)
a) Rút gọn C
b) Tính C khi \(\left|x\right|=1\)
c) Tìm x thuộc Z để C thuộc Z
Thực hiện phép tính:
a, (2x-y)(4x2+2x+y2)
b, (43y2-6x2y3+12x3y3):2x2y2
c, \(\dfrac{3x}{2x-2y}\):\(\dfrac{x^2}{x-y}\)
d, \(\dfrac{x}{x-1}\)+\(\dfrac{2}{1-x}\)\(\dfrac{x+1}{x^2-1}\)
