a) x(2x-7)-2x(x+1)=7
<=> 2x2 - 7x-2x2-2x=7
<=> -9x=7
<=> x=\(\frac{-7}{9}\)
b) 3x(x+8)-x2-2x(x+1)=2
<=> 3x2+24x-x2-2x2-2x=2
<=> 22x=2
<=> x=\(\frac{1}{11}\)
j) (2x – 1)(3x + 1) – (4 – 3x)(3 – 2x) = 3
k) (2x + 1)(x + 3) – (x – 5)(7 + 2x) = 8
m) 2(3x – 1)(2x + 5) – 6(2x – 1)(x + 2) = - 6
tìm X nhé
1. x^2-y^2-2x+2y 2. x^3-x+3x^2y+3xy^2+y^3-y. 3. 4x^4y^4+1. 4. x^2-2x-4y^2-4y. 5.x^3-x^2-x+1. 6.x^2y-x^3-9y+9x. 7.x^3-2x^2+x-xy^2. 8.x^2-2x-4y^2-4y.
a) (3x3 — 2x2 + x +2).(5x2)
b) 3x4(-2x3+5x2-2/3x+1/3)
c) (2x —3)(x2 + 2x — 4)
d) (x -3)(x +7)-(x+5)(x-1)
help plssssss
Phân tích đa thức thành nhân tử (đặt ẩn phụ)
a) (6x+7)^2(3x+4)(x+1)-6
b) (x-2)^2(2x-5)(2x-3)-5
c) (2x-1)(x-1)(x-3)(2x+3)+9
d) (4x+1)(12x-1)(3x+2)(x+1)-4
Tìm x , biết :
a) (3x -1)(2x+7) -(x+1)(6x-5) =16
b) (2x +3)2-2(2x+3)(2x-5)+(2x-5)2= x2+6x+64
c) (x4+2x3+10x-25): (x2+5)=3
tìm x
a)x^4-2x^3-25x^2+50x=0
b)x^2(x-1)-4x^2+8x-4=0
c)9x^2-4-2(3x-2)^2=0
d)9x^2+90x+225-(x-7)^2=0
e)x^3-8+(x-2)(x+1)=0
g)(x+1)(x+2)(x+3)(x+4)-24=0
giúp mk vs ah
Tìm x, biết:
a) x. (2x - 7) - 4x + 14 = 0
b) x2. (x - 1) - 4x + 4 = 0
c) x + x2 - x3 - x4 = 0
d) 2x3 + 3x2 + 2x + 3 = 0
e) 4x2 - 25 - (2x - 5). (2x + 7) = 0
g) x3 + 27 + (x + 3). (x - 9) = 0
Tìm x biết :
a) 3x(x-1)+x-1=0
b) (x-2)(x2+2x+7+2(x2-4)-5(x-2)=0
c) (2x-1)2-25=0
d) x3+27+(x+3)(x-9)=0
Phân tích đa thức thành nhân tử
1. x^2+2xy-8y^2+2xz+14yxz-3z^2
2. 3x^2-22xy-4x+8y+7y^2+1
3. x^4-13x^2-36
4. x^4+3X^2-2x+3
5. x^7+x^2+1
6. x^8+x+1
7. x^8+x^7+1
8. x^10+x^5+1
9. x^2+8x+7
10. (a+b+c)^2+(a+b-c)^2-4c^2
11. (a-b)^3+(b-c)^3+(c-a)^3
12. x^4-6x^3+7x^2+6x-8
