a: \(=16x^4+24x^2y-4x^2y^2-6y^3\)
b: \(=\left(x^4-2x+3\right)\left(x^3+7x-1\right)\)
\(=x^7+7x^5-x^4-2x^5-14x^2+2x+3x^3+21x-3\)
\(=x^7+5x^5-x^4+3x^3-14x^2+23x-3\)
c: \(=x^3-y^3-x^3+y^3=0\)
a: \(=16x^4+24x^2y-4x^2y^2-6y^3\)
b: \(=\left(x^4-2x+3\right)\left(x^3+7x-1\right)\)
\(=x^7+7x^5-x^4-2x^5-14x^2+2x+3x^3+21x-3\)
\(=x^7+5x^5-x^4+3x^3-14x^2+23x-3\)
c: \(=x^3-y^3-x^3+y^3=0\)
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 )
b) x3.(x-1)+x.(x2-x3+2019)=2019
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)
A(x)= -x3 -x (5x3+2-3x )+2+5x4-12x-x2 tại /x/=1
X(x3-y)+x2(y-x2)-y(x2-31)
Cho P = 1 + x + x2 + x3 + ... + x9 + x10 . Chứng minh rằng: x.P - P = x11 - 1
Giusp mik với,mik cảm ơn
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
BÀI 1: NHÂN ĐƠN THỨC VỚI ĐA THỨC
11) \(\dfrac{1}{3}\)x2y2 ( 6x + \(\dfrac{2}{3}\)x2 - y)
12) \(\dfrac{3}{4}\)x3y2 ( 4x2y - x +y5 )
13) -5x2y4 ( 3x2y3 - 2x3y2 -xy)
Tìm x, biết: x(x2−3)=9+x3.
Giá trị của x cần tìm là ...........
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