⇔-(x+2)+3(x-2)(x+2)
⇔(x+2)(1-3x-6)
⇔(x+2)(-3x-5)
\(-(x+2)+3(x^2-4)=-(x+2)+3(x^2-2^2)=-(x+2)+3(x+2)(x-2)=(x+2)(-3x-5)\)
bài 1 rút gọn biểu thức
a) (2x-5)^2-4x(x+3)
b) (x-2)^3 -6(x+4)(x-4)-(x-2)(x^2+2x+4)
c)(x-1)^2-2(x-1)(x+2)+(x+2)^2+5(2x-3)
bài 2 rút gọn biểu thức
a)(2-3x)^2-5x(x-4)+4(x-1)
b)(3-x)(x^2+3x+9)+(x-3)^3
c)(x-4)^2(x+4)-(x-4)(x+4)^2+3(x^2-16)
Phân tích đa thức thành nhân tử:
1.45+x^3-5*x^2-9*x
2.x^4-2*x^3-2*x^2-2*x+3
3.x^4-5*x^2+4
4.x^4+64
5.x^5+x^4+1
6.(x^2+2*x)*(x^2+2*x+4)+3
7.(x^3+4*x+8)^2+3*x*(x^2+4*x+8)+2*x^2
8. x^3*(x^2-7)^2-36*x
9.x^5+x+1
10. x^8+x^4+1
11. x^5-x^4-x^3-x^2-x-2
12. x^9-x^7-x^6-x^5+x^4+x^3+x^2-1
13. (x^2-x)^2-12*(x^2-x)+24
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
Bài 1 : a.3(x-y)^2-2(x+y)^2-(x+y)(x-y) b.3x(x-1)^2-2x(x+3)(x-3)+4x(x-4) c.(x-1)^3-(x+2)(x^2-2x+4)+3(x+4)(x-4) d.(x+2)^3-(x-2)^3
Tìm x
2xy^2+x-6y^2-3=0
Thực hiện phép tính
a)P=x^2-2x-3/x-4 + 3-2x/x-4 (x khác 4)
b)Q=(6-x^2/x^2-4 - x/2-x) chia x+3/x+2 (x khác 2;-2;-3)
Giải phương trình:
a) (x-2)2-(x-3)(x+3)=6
b) (x+3)2 + (4+x)(4-x)=10
c) (x+4)2 + (1-x)(1+x)=7
d) (x-4)2 -(x-2)(x+2)=6
giải các phương trình sau
1/ ( x-2)(x-5)=(x-3)(x-4)
2/ (x-7)(x+7) +x^2 -2=2(x^2+5)
3/ (x-1)^2 +(x+3)^2 =2(x-2)(x=2)
4/ (x+1)^2= (x+3)(x-2)
5/ x^2-(2x-1)(x+3)= 3-x(5+x)
6/ 3(5-2x) -4( x+2) =5x-18
a,x+5/x-1+8/x^2-4x+3=x+1/x-3 b,x-4/x-1-x^2+3/1-x^2+5/x+1=0 c,3x/4-5=3-x/2+5x-1/6 d,(x-2)(x+2)-(x-3)(x+4)-2x+3=0 e,(x-1)^2+2(x+1)=5x+5 g,(x-3)(x+4)x=0
Bài 1: Làm tính nhân
a) -3x^2 . ( 2x^3 - 2x + 1/3 )
b) ( x^4 + 2x^3 - 2/3 ) . ( -3x^4 )
c) ( x + 3 ) . ( x - 4 )
d) ( x - 4 ) . ( x^2 + 4x + 16 )
e) 4. ( x - 1/2 ) . ( x + 1/2 ) . ( 4x^2 + 1 )
Bài 2: Tìm x, biết
a) ( 2 - x ) . (x^2 + 2x + 4 ) + x . ( x - 3 ) . ( x + 4 ) - x^2 + 24 = 0
b) (x/2 + 3 ) . ( 5 - 6x ) + ( 12x - 2 ) . ( x/4 + 3 ) = 0
Bài 1: Làm tính nhân
a) -3x^2 . ( 2x^3 - 2x + 1/3 )
b) ( x^4 + 2x^3 - 2/3 ) . ( -3x^4 )
c) ( x + 3 ) . ( x - 4 )
d) ( x - 4 ) . ( x^2 + 4x + 16 )
e) 4. ( x - 1/2 ) . ( x + 1/2 ) . ( 4x^2 + 1 )
Bài 2: Tìm x, biết
a) ( 2 - x ) . (x^2 + 2x + 4 ) + x . ( x - 3 ) . ( x + 4 ) - x^2 + 24 = 0
b) (x/2 + 3 ) . ( 5 - 6x ) + ( 12x - 2 ) . ( x/4 + 3 ) = 0
