a: \(\Leftrightarrow x^2-4x+4-x^2-4x-3=-7\)
=>-8x=-7-1=-8
=>x=1
b: =>(x-7)(3x^2-2)=0
hay \(x\in\left\{7;\sqrt{\dfrac{2}{3}};-\sqrt{\dfrac{2}{3}}\right\}\)
c: =>x^3+27+(x+3)(x-9)=0
=>(x+3)(x^2-3x+9+x-9)=0
=>x(x+3)(x-2)=0
hay \(x\in\left\{0;-3;2\right\}\)
e: =>(x-3)(5x-2)=0
=>x=2/5 hoặc x=3
f: =>(x+3)(x-3-4)=0
=>x=7 hoặc x=-3
Bài 1: Tìm x
a) (2x-1) ² - 25 = 0
b) 3x (x-1) + x - 1 = 0
c) 2(x+3) - x ² - 3x = 0
d) x(x - 2) + 3x - 6 = 0
e) 4x ² - 4x +1 = 0
f) x +5x ² = 0
g) x ² 2x -3 = 0
giải các phương trình sau:
a.(x - 1)(x + 2)= 0
b.(x -2)(x -5)=0
c.(x +3)(x -5)=0
d.(x + 1/2)(4x + 4)=0
e.(x -4)(5x -10)=0
f.(2x -1)(3x +6)=0
g.(2,3x -6,9)(0,1x -2)=0
Bài 1:Thực hiện phép tính
a,(5-2x)(x+3)-4x(x+2) b,(3x+1)(x-3)-4(x+2)(x-2)
c,3(x-4)(x+3)+(x-5)(x+3) d,2x(x-4)+(3x-1)(2x-5)
Bài 2:Tìm x biết
a,5x(x+3)-(5x+2)(x+3)=7
b,(3x-1)(3x+2)-9(x+2)(x-2)=10
c,(x+1)(2x-5)+2(3-x)(x+2)=7
d,(1-3x)(x+2)+3x(x-5)=8
Giải pt:
a) | 5x | = 3x + 8
b) | -4x | = -2x + 11
c) | 3x - 1 | = 4x + 1
d) | 3 - 2x | = 3x - 7
e) 9 - | -5x | + 2x = 0
f) ( x + 1)² + | x + 10 | - x² - 12 = 0
g) | 4 - x | + x² - (5 + x)x = 0
h) | x - 1 | = | 2x - 3|
i) | x| + | x + 2 | = 4
k) | 2x + 1 | - | 5x - 2 | = 3
l) 2 | x | - | x + 3 | - 1 = 0
1) (3x-2)/3-2=(4x+1)/42) (x-3)/4+(2x-1)/3=(2-x)/63) 1/2 (x+1)+1/4 (x+3)=3-1/3 (x+2)4) (x+4)/5-x+4=x/3-(x-2)/25) (4-5x)/6=2(-x+1)/2 6) (-(x-3))/2-2=5(x+2)/4 7)2(2x+1)/5-(6+x)/3=(5-4x)/158) (7-3x)/2-(5+x)/5=1 9)(x-1)/2+3(x+1)/8=(11-5x)/310)(3+5x)/5-3=(9x-3)/4
1) (x^3 - x^2)- 4x^2 + 8x - 4 = 0
2) 2x^3 - 50x = 0
3) (x + 1) = ( x + 1)(x - 1)
4) ( 3x+1)^2-4(X-3)^2=0
5)(X+3)(X^2-5X+9)-X^3=2X
6) (4X+3)^2-(4X-3)^2-5X-2=0
7)(X-1)^3-(X-3)(X^2+3X+9)-3X(2-X)=5
Bài 1 : Phân tích đa thức thành nhân tử
a) 5x^2y-20xy^2
b) 1-8x+16x^2-y^2
c) 4x-4-x^2
d) x^3-2x^2+x-xy^2
e)27-3x^2
f) 2x^2+4x+2-2y^2
Bài 2: tìm x, biết
a) x^2(x-2023)-2023+x=0
b) -x(x-4)+(2x^3-4x^2-9x):x=0
c) x^2+2x-3x-6=0
d) 3x(x-10)-2x+20=0
BT: Giải các phương trình
a) 4x+5/x-1 + 2x-1/x+1 = 6
b)x+2/x-3 + x-2/x+3 = 2(x^2 + 6)/x^2-9
c)1/x-1 + 3 = 3x-2/x+2
d) 8/x+1 + 1/x-1 = 9/x
e)(4x+1)(3x+7/3-5x + 1)= (x-4)(3x+7/5x-3 - 1)
f) (x^2 + 3x + 1)(4x-3/3x+1 + 2)= (4x+7)(4x-3/3x+1 + 2)
Mọi người giúp mìnnn vớiii
Bài 3 : Tìm x biết
a) (x-2)^2-x(x-3)=0
b) (x+3)(2x+1)-2(x-1)^2=0
c) (4x-5)^2=9(2-5x)^2
d) X^2-6x-13=0
e) (x+2)(x^2-2x+4)-x(x^2+2)=15
f) X^3-6x^2+12x-19=0
các bạn giúp mik bài này vs
5) (4x-5).(x+2)-(x+5).(x-3)-3x^2-x
6) (x-3).(x+7)-(2x-1).(x+2)+x.(x-1)
7) (7x-3).(2x+1)-(5x-2).(x+4)-9x^2+17x
8) -2.(x-7).(x+3)+(5x-1).(x+4)-3x^2-27x
9) (6x-5).(x+8)-(3x-1).(2x+3)-9.(4x-3)
10) (8x-1).(x+7)-(x-2).(8x+5)-11.(6x+1).
