1) 2x – (3 – 5x) = 4( x +3)
2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)
3) 5x - 4(6-x)(x + 3) = (4-2x)(3-2x) + 2
4) (x - 1)3 - (3x + 2)(-12) = (x2 + 1)(x - 2) - x2
5) (3x -1)2 - (x +3)(2x-1) = 7(x + 1)(x -2) -3x
mn giúp mình vs
Giải phương trình :
a) (x2+5x)2 – 2(x2+5x)=24
b) (x3+x+1).(x2+x+2)=12
2x ^3 -5x^2+4x-1) : (2x+1)
(x63 -2x+4) ; (x+2)
(6x^3 - 19x^2+23x-12):(2x-3)
(x^4 - 2 x ^3 - 1+ 2 x ):(x^2 - 1)
(6x^3 - 5x^2 + 4x -1 ) : (2x^2-x+1)
(x^4 -5x^2+4):(x^2-3x+2)
Phân tích đa thức thành nhân tử ( đặt biến phụ):
a) (x^2+x)^2-14(x^2+x) + 24
b) (x^2+x)^2 + 4x^2+4x-12
c) x^4 + 2x^3+ 5x^2+4x-12
d) (x+1)(x+2)(x+3)(x+4)+1
e) (x+1)(x+3)(x+5)(x+7)+15
f) (x+1)(x+2)(x+3)(x+4)-24
tìm x ,biết
a, x^2 -4x =12
b, ( 5x+1)^2 - (5x -3)(5x+3)=30
c, (x-1) ( x^2 +x +1 ) + x(x +2) (2-x)=5
d, 5x(x-3)^2 -5 (x-1)^3 +15 (x+4) (x-4) =5
giup minh phan tich da thuc thanh nhan tu
1)x^2+4x+3
2)x^2-4x+3
3)x^2-x-5
4)x^2+4x-5
5)-x^2-x+6
6)x^2+7x+10
7)-x^2-3x+10
8)x^2+7x+12
9)x^2+4x+3
10)(x^2-2x+63)
11)x^2+10x+24
12)-x^2-4x+21
13)2x^2+11x+12
14)x^2-x+30
15)x^2+11x+30
16)2x^2+5x-12
17)x^2-5x-14
18)2x^2+9x+9
19)x^2+x-72
20)-2x^2-15x+27
21)x^2-x-12
22)-x^2+x+15
23)-x^2+5x+14
24)x^2-7x-18
lam on !!!!!!!!!!!!!!!!!!!!!!!.....!
X(x-3) + x-3 = 0
X3 - 5x = 0
6x2 -(2x+5)(3x-2)=-12
(X+3)(x2-3x+9)- x(x2+2)= 12-5x
X2-25 = 6x-9
3x(x-10)= x-10
X2 + 5x -24=0
(2-x)(x2 +2x +4) - x(x-3)(3+x)= 8
giải các phương trình sau
1, \(\dfrac{5x^2-12}{x^2-1}+\dfrac{3}{x-1}=\dfrac{5x}{x+1}\)
2, \(\dfrac{3}{x-5}-\dfrac{15-3x}{x^2-25}=\dfrac{3}{x+5}\)
3, \(\dfrac{-3}{x-4}-\dfrac{3-5x}{x^2-16}=\dfrac{1}{x+4}\)
Dùng phương pháp nhẩm nghiệm
1) 2x3 - x2 + 5x + 3
2) 2x3 - 5x2 + 5x - 3
3)2x3 + 3x2 + 3x + 1
4) 3x3 - 2x2 + 5x + 2
5)7x3 - 27x2 + 18x – 4
6) (x2 + x)2 - 2(x2 + x) - 15
7) (x2 + x + 1)( x2 + x + 2) - 12
8) (x + 2)(x + 3)(x + 4)(x + 5) - 24
9)x2 + 2xy + y2 - x - y - 12
10) (x + a)(x + 2a)(x + 3a)(x + 4a) + a4
Mình đang cần gấp lắm, mọi người giúp mk mấy câu này nha