`2x^3+6x^2=x^2+3x`
`<=>2x^2(x+3)=x(x+3)`
`<=>x(x+3)(2x-1)=0`
`<=>[(x=0),(x+3=0),(2x-1=0):}`
`<=>[(x=0),(x=-3),(x=1/2):}`
Vậy `S={0;-3;1/2}`
`2x^3+6x^2=x^2+3x`
`<=>2x^2(x+3)=x(x+3)`
`<=>x(x+3)(2x-1)=0`
`<=>[(x=0),(x+3=0),(2x-1=0):}`
`<=>[(x=0),(x=-3),(x=1/2):}`
Vậy `S={0;-3;1/2}`
làm phép chia :
a) (x^4 -2x^3 + 2x -1) : (x^2 - 1)
b) (x^3 -8) : (x^2 + 2x +4)
c) (x^6 - 2x^5 + 2x^4 + 6x^3 - 4x^2)n: 6x^2
d) (-2x^5 + 3x^2 - 4x^3) :2x^2
e) (15x^3 - 10x^2 + x - 2) : (x - 2)
f) (2x^4 - 3x^3 - 3x^2 + 6x - 2) : (x^2 - 2)
4x(5x − 2) 7x Ä 3x 2 − 6x + 2ä b) c) 2x(3x + 2) + (4x + 3)(2x − 1) 3x 3 y 2 : x 2 d) Ä x 3 + 4x 3 − 6x 2 ä : 4x 2 e) Ä 3x 2 − 6x ä f) : (2 − x) Ä 6x 2 + 13x − 5 ä g) : (2x + 5) Ä x 3 − 3x 2 + x − 3 ä h) : (x − 3)
P)(9-x)(x^2+2x-3) n)(-x+3)(x^2+x+1) O)(-6x+1/2)(x^2-4x+2) q)(6x+1)(x^2-2x-3) r)(2x+1)(-x^2-3x+1) U)(2x-3)(-x^2+x+6) s)(-4x+5)(x^2+3x-2) V)(-1/2x+3)(2x+6-4x^3)
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
Thu gọn biểu thức
(6x+1)(2x-5)
(2x+5)2-2x(2x+8)
(3x-5)(2x-1)-(2x+3)(3x+7)+30x
(X-1)2-(x+1)(x-1)
(3x+2)(9x2-6x+4)-(3+x)(x-3)
a. (2x + 5)(2x - 5)
b. (x2 + 3)(3 - x2 )
c. 3x(x -1)2 - 2x(x + 3)(x - 3) + 4x(x - 4)
d. 3x(4x - 3) - (2x -1)(6x + 5)
e. 4x(3x2 - x) - (2x + 3)(6x2 - 3x + 1)
f. (x - 2)(1x + 2)(x + 4)
kết quả của phép nhân 3x(x^2+2x-1) là:
A.3x^3+5x^2-3x
B.3x^2+6x^3-3x
C.3x^3-3x^2+6x
D.3x^3+6x^2-3x
Tìm x
a) 3x(4x - 3) - 2x(5 - 6x) = 0
b) 5(2x - 3) + 4x(x - 2) + 2x(3 - 2x) = 0
c) 3x(2 - x) + 2x(x - 1) = 5x(x + 3)
d) 3x (x + 1) - 5x(3 - x) + 6(x^2 + 2x + 3) = 0
I) THỰC HIỆN PHÉP TÍNH a) 2x(x^2-4y) b)3x^2(x+3y) c) -1/2x^2(x-3) d) (x+6)(2x-7)+x e) (x-5)(2x+3)+x II phân tích đa thức thành nhân tử a) 6x^2+3xy b) 8x^2-10xy c) 3x(x-1)-y(1-x) d) x^2-2xy+y^2-64 e) 2x^2+3x-5 f) 16x-5x^2-3 g) x^2-5x-6 IIITÌM X BIẾT a)2x+1=0 b) -3x-5=0 c) -6x+7=0 d)(x+6)(2x+1)=0 e)2x^2+7x+3=0 f) (2x-3)(2x+1)=0 g) 2x(x-5)-x(3+2x)=26 h) 5x(x-1)=x-1 IV TÌM GTNN,GTLN. a) tìm giá trị nhỏ nhất x^2-6x+10 2x^2-6x b) tìm giá trị lớn nhất 4x-x^2-5 4x-x^2+3
rút gọn áp dụng hằng đẳng thức
1. (x-3)*(x+3)-(x-3)^2
2. (6x+1)^2 + (6x-1)^2-2*(6x+1)*(6x-1)
3. (3x-1)^2 +2*(3x-1)*(2x+1)+(2x+1)^2
nhớ ghi cách giải nha!!!!