tim x biet (x^2+2x+1)(x+2)-x^2(x-3)-7x(x-1)=3x-9
Tim x, biet:
a)(x-3)^3-(x-3)(x^2+3x+9)+9(x-1)^2=15
b)(x^2-2)^2+4(x-1)^2-4(x^2-2)(x-1)=0
Giup minh voi!
tim x biet
(2x=1)^2 - 4(x=2)^2=9
3(x-1)^2 -3x(x-5)=1
3(x+2)^2+ (2x-1)^2 =7
7(x+3)(x-3)=36
Cho 2 bieu thuc :
A=\(\dfrac{x-3}{x+2}va\) B= \(\dfrac{3}{x+3}+\dfrac{2}{x-3}-\dfrac{3x-9}{x^2-9}\left(x-2,x\ne3x\ne-3\right)\)
a, Tinh gia tri bieu thuc A khi x=5
b, Chung minh : B=\(\dfrac{2}{x-3}\)
c, Biet C = A.B, Tim x de c = \(\dfrac{-1}{3}\)
Tim x biet
a) 28x^3+15x^2+75x+125=0
b)4x^2-x-5=0
Phan tich da thuc thanh nhan tu
a) x^3+5x^2+3x-9
b)x^3-7x-6
c)3x^3-7x^2+17x-5
Tim x biet
a) 28x^3+15x^2+75x+125=0
b)4x^2-x-5=0
Phan tich da thuc thanh nhan tu
a) x^3+5x^2+3x-9
b)x^3-7x-6
c)3x^3-7x^2+17x-5
tim x biet x^3-3x^2+3x-1=0
tim a b biet x ^4-3x +2=(x-1)(x^3+ax^2+bx-2)
tim x
a) 5x(x-3)(x+3)-(2x-3)2 - 5(x+2)3 +3x(x+2)=1
b) (x-2)3 +6(x+1)2 -(x-3)(x2 +3x+9)=97
