(x-3).(2x+4)+(-x+1).(x-2)
= ( 2x2 + 4x - 6x -12 ) + ( -x2 + 2x + x - 2 )
= 2x2 + 4x - 6x -12 - x2 + 2x + x - 2
= x2 + x - 14
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Bài 2: Nhân đa thức với đa thức
Các câu hỏi tương tự
Bài 1:a) x (x^2 + 2) + 2x(1-dfrac{1}{2}x^2)4 b) (2x)^2 (x – 1) + x(x^2 + 4x) 40c) 3x(x – 2) – 3(x^2 – 3) 8d) 2x^2(4x^3 + 2x) + (x^2 – 2)(- 2x)^3 20Bài 2: P 3x(dfrac{2}{3}x^2 − 3x^4) + (3x)^2 (x^3 – 1) + (- 2x + 9)x^2 - 12
Đọc tiếp
Bài 1:
a) x (\(x^2\) + 2) + 2x\((1-\dfrac{1}{2}x^2)=4\)
b) (2x)\(^2\) (x – 1) + x(\(x^2\) + 4x) = 40
c) 3x(x – 2) – 3(\(x^2\) – 3) = 8
d) 2\(x^2\)(4\(x^3\) + 2x) + (\(x^2\) – 2)(- 2x)\(^3\) = 20
Bài 2:
P = 3x(\(\dfrac{2}{3}\)\(x^2\) − \(3x^4)\) + (3x)\(^2\) (\(x^3\) – 1) + (- 2x + 9)\(x^2\) - 12
1. (2x +3) (x- 5) +(X-4 ) + (x-5) ( x-2 0 = (3x -5) ( x-4)
2. (8x-3) (3x +2) - (4x+ 7) (x+4) = (2x + 1) (5x-1)
3. 2x^2 + (x -1) (x+1)= 5x (x+10
4. 4- ( x-1) (x+5) - (x+2) (x+5) = 3(x-1) (x+2)
Tìm x, biết :
a, ( x +2 ) ( x^2 - 2x + 4 ) - x( x + 3 ) ( x - 3) = 26
b, ( x - 3 ) ( x^2 + 3x + 9 ) - x( x - 4 ) ( x + 4 ) = 21
c, ( 2x -1 ) ( 4x^2 + 2x + 1 ) - 4x(2x^2 - 3 ) = 23
a\(8\left(x+\dfrac{1}{x}\right)^{2^{ }}+4\left(x^{2^{ }}+\dfrac{1}{x^2}\right)-4\left(x^2+\dfrac{1}{x^2}\right)\left(x+\dfrac{1}{x}\right)=\left(x+4\right)^2\)giải các phương trình\(\dfrac{x+4}{2x^2-5x+2}+\dfrac{x+1}{2x^2-7x+3}=\dfrac{2x+5}{2x^2-7x+3}\)
Tìm x biết
a) (2x+3)(x–4)+(x–5)(x–2)=(2x+1)(x–4)
b)(8x–3)(3x+2)–(4x+7)(x+4)=(2x+1)(5x–1)
c) 2x^2+3(x–1)(x+1)=5x(x+1)
d) (8–5x)(x+2)+4(x–2)(x+1)+(x–2)(x+2)
e)4(x–1)(x+5)–(x+2)(x+5)=3(x–1)(x+2)
Thực hiện phép tính
a) (2x+3)*(4x+5)
b) (x-2)*(3x-4)
c) (x+2)*(x2-2x+4)
d) (3x2-x-2)*(x-3)
e) (5x2-x-1)*(-x+3)
f) (x+2)*(3x-1)+x*(x2-x+2)
g) (x-3)*(3-x)+x*(x2-3)
h) (2x-4)*(2x+4)-(4x2+16)
i) x*(x+3)-x2(x-2)
k) (x+2)*(3x-1)-(2x-1)*(-x+3)
Rút gọn biểu thức sau:
a. A= ( 5- x ). (x + 5) - 2.( x - 1). ( x - 3) - 3.( x - 2)2
b. B= ( 3 - 2x).( x - 2) + ( 2x - 5)2 - ( x - 4)
c. C= ( x - 4). ( x - 2) - 3.( x - 2) . ( 3 - 2x) - ( 2x + 1)2
d D= 2.( x - 1)2 - 3.( x - 1). ( x + 2) - ( 2x + 1)2
Bài 1
1) (x^2-2x+3)*(x-4)
2) (2x^2-3x-1)*(5x+2)
3) (x^2-2xy+y^2)*(y^2+2xy+x^2+1)
4) (x-7)*(x+5)*(x-5)
5) (x+2y)*(x-y)
6) (x+5)*(x^2-2x+3)
7) 2x(x+5)*(x-1)
8) (x-2y)*(x+2y)
9) (x-1)*(x^2+x+1)
10) (1-2x^2+x)*(x-4+x^2)
Tính(rút gọn)
1, x^ 2 - 2x + 5 - (x - 7)(x + 2)
2,-5x(x-5)+(x-3)(x^2-7)
3, x(x^2-x-2)-(x+5)(x-1)
4, (-x+5)(x+3)+(2x-1)(x+3)
5, -4x(x+3)(x-4)-3x(x^2-x+1)
Tìm x:
1. 3x (2x + 3) - (2x + 5).(3x - 2) 8
2. 4x (x -1) - 3(x2 - 5) -x2 (x - 3) - (x + 4)
3. 2 (3x -1) (2x +5) - 6 (2x - 1) (x + 2) -6
4. 3 ( 2x - 1) (3x - 1) - (2x - 3) (9x - 1) - 3 -3
5. (3x - 1) (2x + 7) - ( x + 1) (6x - 5) (x + 2) - (x - 5)
6. 3xy (x + y) - (x + y) (x2 + y2 + 2xy) + y3 27
7. 3x (8x - 4) - 6x (4x - 3) 30
8. 3x (5 - 2x) + 2x (3x - 5) 20
HELP ME T^T
Đọc tiếp
Tìm x:
1. 3x (2x + 3) - (2x + 5).(3x - 2) = 8
2. 4x (x -1) - 3(x2 - 5) -x2 = (x - 3) - (x + 4)
3. 2 (3x -1) (2x +5) - 6 (2x - 1) (x + 2) = -6
4. 3 ( 2x - 1) (3x - 1) - (2x - 3) (9x - 1) - 3 = -3
5. (3x - 1) (2x + 7) - ( x + 1) (6x - 5) = (x + 2) - (x - 5)
6. 3xy (x + y) - (x + y) (x2 + y2 + 2xy) + y3 = 27
7. 3x (8x - 4) - 6x (4x - 3) = 30
8. 3x (5 - 2x) + 2x (3x - 5) = 20
HELP ME T^T