\(B=\left(x+1\right)\left(x+2\right)\left(x+3\right)\left(x+4\right)-24\)
\(=\left(x^2+5x+4\right)\left(x^2+5x+6\right)-24\)
\(=\left(x^2+5x\right)^2+10\left(x^2+5x\right)\)
\(=\left(x^2+5x\right)\left(x^2+5x+10\right)\)
\(=x\left(x+5\right)\left(x^2+5x+10\right)\)
a) (3x-1).(2x+7)-(x+1).(6x-5)=7
b) (x+1)^3-x.(x-2)^2+x-1=0
c) (x+2).(x^2-2x+4)-x(x^2+3)
d) 2x.(x-3)-5.(3-x)=0
giúp mình ạ cần gấp
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
phân tích đa thức thành nhân tử
1.(x+2)(x+3)(x+4)(x+5)-24
2.(x-1)(x-3)(x-5)(x-7)-20
3.x(x-1)(x-1)(x+2)-3
4.(x-7)(x-5)(x-4)(x-2)-72
5.(x^2+6x+8)(x^2-8x+15)-24
6.(x^2-6x+5)(x^2-10x+21)-20
7.(x^2+5x+6)(x^2-15x+56)-144
#Mn làm giúp mik vs#
#thank kiu#
giải các phương trình sau:
a.2x + 3 = 7x - 7
b. \(\dfrac{x}{x+2}+\dfrac{x-1}{x-2}=\dfrac{2x^2+x}{x^2-4}\)
c.|x-1|=1
d.6x - 2 = 2x + 10
e. \(\dfrac{x}{2}+\dfrac{x+1}{3}=\dfrac{5}{2}\)
f.|x-1|=x+2
g.9x - 6 = 3x+12
h.x(x-1)+3(x-1)=0
i.\(\dfrac{7}{x}+\dfrac{2}{x+1}=\dfrac{x+23}{x\left(x+1\right)}\)
j.8x - 3=6x +9
k. |x-1|-4=5
l.\(\dfrac{x-5}{x^2-16}+\dfrac{3}{x+4}=\dfrac{7}{x-4}\)
phân tích đa thức thành nhân tử
1.(x+2)(x+3)(x+4)(x+5)-24
2.(x-1)(x-3)(x-5)(x-7)-20
3.x(x-1)(x-1)(x+2)-3
4.(x-7)(x-5)(x-4)(x-2)-72
5.(x^2+6x+8)(x^2-8x+15)-24
6.(x^2-6x+5)(x^2-10x+21)-20
7.(x^2+5x+6)(x^2-15x+56)-144
#Mn làm giúp mik vs#
#thank kiu#
phân tích đa thức thành nhân tử
1.(x+2)(x+3)(x+4)(x+5)-24
2.(x-1)(x-3)(x-5)(x-7)-20
3.x(x-1)(x-1)(x+2)-3
4.(x-7)(x-5)(x-4)(x-2)-72
5.(x^2+6x+8)(x^2-8x+15)-24
6.(x^2-6x+5)(x^2-10x+21)-20
7.(x^2+5x+6)(x^2-15x+56)-144
#Mn làm giúp mik vs#
#thank kiu#
phân tích đa thức thành nhân tử
1.(x+2)(x+3)(x+4)(x+5)-24
2.(x-1)(x-3)(x-5)(x-7)-20
3.x(x-1)(x-1)(x+2)-3
4.(x-7)(x-5)(x-4)(x-2)-72
5.(x^2+6x+8)(x^2-8x+15)-24
6.(x^2-6x+5)(x^2-10x+21)-20
7.(x^2+5x+6)(x^2-15x+56)-144
#Mn làm giúp mik vs#
#thank kiu#
Giải phương trình sau ( Đặt ẩn phụ )
a) (x^2+x)^2+4(x^2+x)-12=0
b) (x^2+2x+3)^2-9(x^2+2x+3)+18=0
c) (x-2)(x+2)(x^2-10)=72
d) x(x+1)(x^2+x+1)=42
e) (x-1)(x-3)(x+5)(x+7)-297=0
f) x^4-2x^2-144x-1295=0
1.Tìm x
a) (x - 5)(x + 5) - (x + 3)^2 + 3 (x - 2)^2 = (x + 1)^2 - (x + 4)(x - 4) +3x^2
b) (2x + 3)^2 + (x - 1)(x + 1) = 5 (x + 2)^2 - (x - 5)(x + 1) + (x + 4)^2
c) (-x + 5)(x - 2) + (x - 7)(x + 7) = (3x + 1)^2 - (3x - 2)(3x + 2)
d) (5x - 1)(x + 1) - 2(x - 3)^2 = (x + 2)(3x - 1) - (x + 4)^2 + (x^2 - x)
2.Rút gọn :
a) A= 3 (x - 1)^2 - (x + 1)^2 + 2(x - 3)(x + 3) - (2x + 3)^2 - (5 - 20x)
b) B= 5x (x - 7)(x + 7) - x (2x - 1)^2 - (x^3 + 4x^2 - 246x) - 175
c) C = -2x (3x + 2)^2 + (4x + 1)^2 + 2 (x^3 + 8x + 3x - 2 ) - (5 - x)
