`@` `\text {Ans}`
`\downarrow`
`(6x^3-4x^2+3x) \div (-1/2x)`
`= 6x^3 \div (-1/2x) - 4x^2 \div (-1/2x) + 3x \div (-1/2x)`
`= -12x^2 + 8x - 6`
\(=-6x^3:\dfrac{1}{2}x+4x^2:\dfrac{1}{2}x-3x:\dfrac{1}{2}x\)
=-12x^2+8x-6
`@` `\text {Ans}`
`\downarrow`
`(6x^3-4x^2+3x) \div (-1/2x)`
`= 6x^3 \div (-1/2x) - 4x^2 \div (-1/2x) + 3x \div (-1/2x)`
`= -12x^2 + 8x - 6`
\(=-6x^3:\dfrac{1}{2}x+4x^2:\dfrac{1}{2}x-3x:\dfrac{1}{2}x\)
=-12x^2+8x-6
: Tìm x, biết:
a) 3x( 4x- 1) - 2x(6x- 3 )=30 b) 2x(3-2x) + 2x(2x-1)=15
c) (5x-2)(4x-1) + (10x +3)(2x - 1)=1 d) (x+2) (x+2)- (x -3)(x+1) = 9
e) (4x+1)(6x-3) = 7 + (3x – 2)(8x + 9) g) (10x+2)(4x- 1)- (8x -3)(5x+2) =14
a,2(1-6x)=(8+2x)
b,1/3-2x/5=1/10+4x/7
c,1-3x/+1=5-6x/2
câu c là tử số là 1-3x và 5-6x
Thu gọn đa thức sau :
a. (x+3) + 2x^2( 2x-3)-2x^3
b. -3x(x^2+x-3)-8+8x^3-6x
c.4x^2+3x^3+1-4x
a, 3-3/2.(2x-1)-1/2.(3x+2)=2x-3
b, 7/2+1/2.(4x-3/2)-1/3.(3-6x)=1/2.(x-1)
c, 3/2.(2x-1/2)-7/2.(3x+1/3)-1/2.(2x-1)=3x+5
Thực hiện phép chia:
a) \((3x^5-9x^6+12x^9):3x\)
b) \((6x^4+4x^3+8x^2):(2x)\)
c) \((8x^6+16x^5-10x^4):(2x^4)\)
d) \((4x^4+6x^5+14x^7):(2x^3)\)
tìm x
5)
4x x 5 x 4x 3 5
6)
2
2
x 2 x 1 6
7)
2
3
(3 2) 3 .
4
x x x
8) (3x + 1). (2x- 3) – 6x.(x + 2) = 16
Tính:
\(a)\left(-2x^2\right)\cdot\left(3x-4x^3+7-x^2\right)\)
\(b)\left(x+3\right)\cdot\left(2x^2-3x-5\right)\)
\(c)\left(-6x^5+7x^4-6x^3\right):3x^3\)
\(d)\left(9x^2-4\right):\left(3x+2\right)\)
\(e)\left(2x^4-13x^3+15x^2+11x-3\right):\left(x^2-4x-3\right)\)
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
bài 2 : cho hai đa thức
A(x)=1/4x mũ 3 + 11/3x mũ 2 - 6x - 2/3x mũ 2 + 7/4x mũ 3 +2x +3
B(x)= 2x mũ 3 + 2x mũ 2 - 3x + 9
a, thu gọn và sắp xếp đa thức A(x) theo lũy thừa giảm dần của biến