\(\left(x^2+1\right)\left(x-1\right)^2\left(3x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2+1=0\\\left(x-1\right)^2=0\\3x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x^2=-1\left(vl\right)\\x=1\\x=\dfrac{1}{3}\end{matrix}\right.\)
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
1/ Thực hiện phép tính:
a/ x2(x - 2x3)
b/(x2+1).5x
c/(x-2)(x2+2x+4)
d/ (x - 2)(x2+2x+4)
e/ (x2 - 1)(x2+ 1)
f) (2x-1)(3x + 2)(3 - x)
. Rút gọn:
a) -2x(-3x +2)- (x+2)2
b) (x+2)(x2- 2x+4) -2( x+1)( 1-x)
c) (2x-1)2- 2(4x2-1) + (2x+1)2
3x+2/x2-2x+1 - 6/x2-1 - 3x-2/x^2+2x+1
Bài 5: Biết :
a. 3x + 2( 5 - x ) = 0
b. 2x( x + 3 ) + 2( x + 3 ) = 0
Giá trị của x cần tìm là ?
Bài 6: Rút gọn biểu thức:
A = 2x2(-3x3 + 2x2 + x - 1) + 2x(x2 – 3x + 1) giúp mik nhanh dc ko
Bài1:Làm tính nhân:
a) 2x. (x2– 7x -3) b) ( -2x3+ y2-7xy). 4xy2 c)(-5x3).(2x2+3x-5)
d)(x2-2x+3). (x-4) e) ( 2x3-3x -1). (5x+2) g) 3(2x-1)-5(x-3)
Tìm x bt
1) 3.(2x−1).(3x−1)−(2x−3).(9x−1)−3=−3
2) 3x−1.(2x+7)−x+1.(6x−5)=x+2−(x−5)
3) 3xy.(x+y)−(x+y).(x2+y2+2xy)+y3=27
4) 5.x+1.(1−x).(2x2+3)=0
giúp mk vs mai mk đi hk rù
Tìm x bt
1) 3.(2x−1).(3x−1)−(2x−3).(9x−1)−3=−3−3
2) 3x−1.(2x+7)−x+1.(6x−5)=x+2−(x−5)
3) 3xy.(x+y)−(x+y).(x2+y2+2xy)+y3=27
4) 5.x+1.(1−x).(2x2+3)=0
giúp mk vs mai mk đi hk rùi
6). – x2 y(xy2 – 1/2 xy + 3/4 x2 y2 )
7). (3xy – x2 + y). 2/3 x2 y
8). (4x3 – 5xy + 2x)( – 1/2 xy)
9). 2x2 (x2 + 3x + 1/2 )
10). – 3/2 x4 y2 (6x4 − 10/9 x2 y3 – y5 )
11). 2 3 x3 (x + x2 – 3/4 x5 )
12). 2xy2 (xy + 3x2 y – 2/3 xy3 )
13). 3x(2x3 – 1/3 x2 – 4x)
14). 3/5 x3 y5 (7x4 + 5x2 y − 10/21 x4 y3 –y4 )
A(x)= -x3 -x (5x3+2-3x )+2+5x4-12x-x2 tại /x/=1
