b)(x-2)3-(x-3)(x2+3x+9)+6(x+1)2=49
(=) x3- 6x2 +12 x -8 - ( x3 - 27 ) + 6( x2 + 2x +1)
(=) x3 - 6x2 +12x -8 - x3 +27 + 6x2 +12x +6
(=) 24x + 25 = 49
(=) 24x = 49 - 25 = 24
(=) x = 24/24 =1
1, ( x+1/3)^3
2, ( 2x+y^2)^3
3, ( 1/2x^2+1/3y)^3
4, ( 3x^2-2y)^3
5, ( 2/3x^2-1/2y)^3
6, ( 2x+1/2)^3
7, ( x-3)^3
8, ( x+1).(X^2+3x+9)
9, ( x-3).( x^2+3x+9)
10, ( x-2).( x^2+2x+4)
11, ( x+4).( x^2-4x+16)
12, ( x-3y).( x^2+3xy+9y^2)
13, ( x^2-1/3). ( x^4+1/3x^2+1/9)
14, ( 1/3x+2y).( 1/9x^2-2/3xy+4y^2)
Đưa về HĐT
Bài 3. Rút gọn các đa thức sau
a/ (2x-3)(4x^2+6x+9)- (2x+1)(4x^2 - 2x +1)
b/ (x+ 2)(x^2- 2x+4) – (x^3- 2)
c/ (3x+ 5)(9x^2 - 15x +25)- 3x(3x-1)(3x+1)
d/ x^6 - (x^2 + x +1)(x^2 - 1)(x^2 - x+ 1)
Rút gọn :
1. (2x-5)(3x+1)-(x-3)^2+(2x+5)^2-(3x+1)^3
2. (2x-1)(2x+1)-3x-2)(2x+3)-(x-1)^3+(2x+3)^3
3. (x-2)(x^2+2x+4)-(3x-2)^3+(3x-4)^2
4. (7x-1)(8x+2)-(2x-7)^2-(x-4)^3-(3x+1)^3
5. (5x-1)(5x+1)-(x+3)(x^2-3x+9)-(2x+4)^2-(3x-4)^2+(2x-5)^3
6. (4x-1)(x+2)-(2x+5)^2-(3x-7)^2+(2x+3)^3=(3x-1)^3
Giúp mình với!!!!!!!!!!!!!!!!!!
1, Tìm x
(x+ 3)3- x.(3x+1)2+ (2x+1). (4x2-2x+1) =28
2, Rút gọn
(a+b+c)2+(b+c-a)2+(c+a-b)2+(a+b-c)2
Bài 1: Thu gọn các biểu thức sau
a)(2x2 + 5x - 2)(2x2 - 4x +3)
b)(2x -3)(3x - 2) - 3x(2x - 5)
c)(x -1)(x2 + x + 1) - (x + 1)(x2 - x +1)
d)(x2 + x - 1)(x2 - x + 1)
e)(2 + 3y)2 - (2x -3y)2 -12xy
d)(x2 - 4x)(5 + 2x - x2)
cảm ơn!giúp mình với chiều nay ktra 15ph T_T
Bài 1: Viết thành tích
1: 81-100n^8.
2:m^2 -25
3:16x^2 -25y^2
4: 100a^2b^4 -49
5:8x^3 -27y^6
6: 64 + 125a^6
7: x^6 -y^6
8: -8y^9 -x^6
9:1/4x^4y^2 -3x^5y +9x^6
10:x^2 -2xy -16 +y^2
11: x^2 -6x -y^2 +9
12:x^2 -9 +4xy + 4y^2
Bài 2: Phân tích đa thức thành nhân tử
a, x^4 +2x^3 +x^2
b, x^3 -x +3x^2y + 3xy^2 +y^3 -y
c, 5x^2 -10 xy +5y^2 -20 z^2
d, x^2 +5x -6
e, 5x^2+5xy - x - y
f, 7x -6x^2 -2
g, x^2 +4x +3
h, 2x^2 +3x -5
i, 16x - 5x^2 -3
j, (x^2 +x)^2 +1 (x^2 +x) -12
k, (x^2 +x +1) . (x^2 +x +1) -12
I, (x+1) . (x+2) .(x+3) .(x+4) -24
Bài3:Tìm x biết
1, (x+3) (x^2 -3x +9) - x(x^2-3) = 8(5 -x)
2, (2x +1)^3 +(2x+3)^3 = 0
3, (5x +1)^2 - (5x -3) (5x +3) = 30
4, ( x+3) (x^2 -3x+9) - x(x-2) (x+2) = 15
Mọi người làm giúp mình vs mai mình nộp r
tìm x:
(x+3)3 - (x(3x+1)2 + (2x+1)4x2 - (2x+1) - 3x2=54
(x-3)3 - (x-3)(x2+3x+9)+ 6(x+1)2 + 3x2 = -33
Bài 1: Khai triển hằng đẳng thức:
a, ( x - y + 2z )2
b, ( 2x-3 ). ( 2x+3 ) . ( 4x2+9 )
Bài 2: Rút gọn biểu thức:
a, ( 5x+2 ).( 2-5x ) - ( 3x+2 ).( 2x+5 )2
b, ( -2x-3 )2 + 2(2x+1).( 2x+5 ) + ( 2x+5 )2
Bài 1/ a)(3+x)(x^2-9)-(x-3)(x^2+3x+9)
b)(x+6)^2-2x(x+6)+(x-6)(x+6)
c)2x(x-3y)+3y(2x-5y)
Bài 2/a) 49x^2-1=0 b) (2x-1)^2-(4x+1)(x+3)=-3
Bài 3/ A=x^2+2y^2-2xy+4x-2y+12