Bài 1:
b: \(=2\left(4x^2+20x+25\right)+3\left(16x^2-1\right)\)
\(=8x^2+40x+50+48x^2-3\)
\(=56x^2+40x+47\)
Bài 2:
b: \(\Leftrightarrow3x-3+9x-18=2x-6+4x-4\)
=>12x-21=6x-10
=>6x=11
hay x=11/6
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
Tìm x
a,(7x+4)^2-(7x+4)(7x-4)=0
b, 5( x + 3 )( x - 3 ) + ( 2x + 3 )^2+(x-6)^=10
c, (x + 1)^3 + (x – 2)^3 – 2x^2 (x – 1,5) = 3
d,( x + 2)(x^2 – 2x + 4)(x – 2)(x^2 + 2x + 4) = – 65
e, 4x^2 + 4x – 5 = 2
f,16x^2 – 9(x + 1)^2 = 0
Các bạn giúp mình vs mai mình phải nộp rùii
Tìm x, biết
a, 16x^2 - ( 4x-5)^2 = 15
b, (2x+3)^2 - 4(x-1)(x+1) = 49
c, (2x+1)(1-2x) + ( 1-2x)^3 =18
d, 2(x+1)^2 - ( x-3)(x+3) - (x
-4)^2 = 0
e, (x-5)^2 - x(x-4) = 9
f, ( x-5)^2 + ( x-4)(1-x) = 0
Giúp mk vs ạ mình đang cần
A, (x-2)^2=4x^2+4x+1 B, 25x^2-9=0 C, (2x-1)^2+(x+3)^2-5(x+7)(x-7)=0 D, (2x+1)(x-4)-2(x-3)^2=8 E, (3x-1)^2=(5-x)^2
Rút gọn các biểu thức sau:
a) 2x(2x-1)^2-3x(x+3)-4x(x+1)
b)(3x+1) (3^2+1) (3^4+1).....(3^100+1)
c) 5x(x^2-x)-x^2(5x-5) -15
d) (x+5)^2 - 4x(2x+3)^2 - (2x-1) (x+3) (x-3)
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
Rút gọn:
1. (x+3)3- x +2)(x-2)-6x2-20
2. (2x+3)(4x2-6x+9)-(2x-3)(4x2+6x+9)
3. (2x-1)(4x2+2x+1)(2x+1)(4x2-2x+1)
4. (x+4)(x2-4x+16)-(50+x2)
Giúp mình với. Cảm ơn!!!
Rút gọn:
A=(x-3)²-(2x-1)(2x+1)
B=(2x-3)²-(x-1)(2x+1)
C=4x(x-3)-(4-2x)²
D=3x(x-1)(x-2)-x(2x-1)²
E=(4-x)(x+4)-(x+2)²
P=(2x+3)²-(2x+1)(2x-1)
Q=(4-3x)²-(9x-1)(9x+1)
M=(5+x) (x-5)-(x-3)²
N=2(3x+1)(x-2)-6(x+2)²
