`@` `\text {Ans}`
`\downarrow`
`a,`
`x^2 (5x^3 - x - 1/2)`
`= x^2*5x^3 + x^2* (-x) + x^2 * (-1/2)`
`= 5x^5 - x^3 - 1/2x^2`
`@` `\text {Ans}`
`\downarrow`
`a,`
`x^2 (5x^3 - x - 1/2)`
`= x^2*5x^3 + x^2* (-x) + x^2 * (-1/2)`
`= 5x^5 - x^3 - 1/2x^2`
Tìm a + b biết x 2 + 5 x 3 − 3x − 2 = a x − 2 + b (x + 1) 2 ?
A. -2.
B. 1.
C. -1.
D. 2.
Bài 1: Làm tính nhân:
a) 2x. (x2 – 7x -3) b) ( -2x3 + y2 -7xy). 4xy2
c)(-5x3). (2x2+3x-5) d) (2x2 - xy+ y2).(-3x3)
e)(x2 -2x+3). (x-4) f) ( 2x3 -3x -1). (5x+2)
g) ( 25x2 + 10xy + 4y2). ( ( 5x – 2y) h) ( 5x3 – x2 + 2x – 3). ( 4x2 – x + 2)
rút gọn
a) x2 (5x3-x-6)
b)(6x2-5) (2x+3)
c)(x2-2x+1):(x-1)
d)3x (x2+x-1)
a) 2x. (x2 – 7x -3)
b) ( -2x3 + y2 -7xy). 4xy2
c)(-5x3). (2x2+3x-5)
d) (2x2 - xy+ y2).(-3x3)
e)(x2 -2x+3). (x-4)
f) ( 2x3 -3x -1). (5x+2)
g) ( 25x2 + 10xy + 4y2). ( 5x – 2y)
h) ( 5x3 – x2 + 2x – 3). ( 4x2 – x + 2)
Tính:
a) ( 5x3 - x - 1/2 )
b) ( 3xy - x2 + y ) 2/3 x2y
c) ( 4x3 - 5xy + 2x ) ( -1/2xy )
d) ( x2 - 2x + 1 ) ( x - 1)
câu hỏi: xác định a sao cho:
a, 5x3+4x2-6x-a chia hết cho 5x-1
b, x3 + x2-x+a __________ (x+1)2
a) 2x. (x2 – 7x -3)
c) (-5x3).(2x2+3x-5)
e) (x2 -2x+3). (x-4)
f) ( 2x3 -3x -1). (5x+2)
a)(-3x2+5x2-9x+15):(-3x+5)
b)(x4-2x3+2x-1):(x2-1)
c)(5x4+9x3-2x2-4x-8):(x-1)
d)(5x3+14x2+12x+8):(x+2)
Tìm tổng A+B và Hiệu A-B của hai đa thức biết
A=x4+5x3-x2-x+1 và b=x4+2x3-2x2-3x+2