`@` `\text {Ans}`
`\downarrow`
`-4x^2(x^2-3x+1/2)`
`= (-4x^2)*x^2 + (-4x^2)*(-3x) + (-4x^2)*1/2`
`= -4x^4 + 12x^3 - 2x^2`
`@` `\text {Ans}`
`\downarrow`
`-4x^2(x^2-3x+1/2)`
`= (-4x^2)*x^2 + (-4x^2)*(-3x) + (-4x^2)*1/2`
`= -4x^4 + 12x^3 - 2x^2`
Bài 3: Cho hai đa thức:
P(x)= \(2x^3-2x+x^2+3x+2\)
Q(x)= \(4x^3-3x^2-3x+4x-3x^3+4x^2+1\)
a) Rút gọn P(x),Q(x)
b) Chứng tỏ x=-1 là nghiệm của P(x),Q(x)
1)(2x-3).(x2+4x-3)-(3x-2).(5x-1)
2)(4x2-3x-1).(x-2)-(4x-3).(2x+1)
a)(2x^2-x+3)-(x^2-4x+2)+(x^2-5x-1)
b)(-3x^2+2x-5)-(4x^-2x-7)+(3x^2-8x+1)
Bài 2 Tìm x biết 1, (2x-2).(3x+1)-(3x-2).(2x-3)=5 2,(1-3x).(3x-5)-(2x-4)(2-3x)=x-6 3,(2x-1).(4x^2+2x+1)-(2x+1)(4x^2-2x+1)=5x+6 Giúp tớ với
Cho hai đa thức P(x)= 2x^3-2x+x^2+3x+2
Q(x)=4x^3-3x^2-3x+4x-3x^3+4x^2+1
a) Rút gọn P(x),Q(x)
b)Tính P(x)+Q(x)
: 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
TÌm nghiệm
a) 3x - (3 - 2x)
b) ( x +2 ) . 3 - 4x . 3
c) (x - 2 )(x-4)(1-7x)
d) 4x^2 - 1/4
e) -3x^2 + 48
g) 3.(1/2 - 1/3x)^3 - 1/9
m) 4x^3 + 5x^4
h) -x^3 + 1/64 x
k) (x^2 +1 ) ^2 + 3x(x^2 + 1 ) +2
Q(x)=(1+4x-4x^2)^2005(1+x^2)^10(1-4x+x^2+3x^3)^2006
Bài : Rút gọn
1) (3x - 5).(7-5x)-(5x+2).(2-3x)
2) (3x2+5x-2).(2x2-4x+3)
3) (3x2+5x-2).(2x2-4x+3)
4)4(2x3+x)-(2x-1)(4x2+3x+1)
5) 2x(x+3)-(x-5).(7+2x)
Nhanh + đúng auto tick :Đ!
thu gọn biểu thức
a, 3x*(x+2)+4x*(-2x+3)+(2x-3)*(3x+1)
b,(x2+1)*(x2-x+2)-(x2-1)*(x2+x-2)
c,(-2x-3)2+(3x+2)2+(4x+1)