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(x2– y2 + 6x + 9) : (x + y + 3) = (x2 + 6x+ 9) – y2 : (x + y + 3)
=(x + 3)2 – y2 : (x + y + 3) = (x + 3 – y) (x + 3 + y) : (x + y + 3) = (x – y + 3)
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đặt tính theo cột dọc, ta nhận được kết quả:
\(\left(2x^4-3x^3-7x^2-5x-3\right):\left(2x^2+x+1\right)\)
\(=x^2-2x-3\)
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\(\left(6x^3-7x^2-x+2\right):\left(2x+1\right)\)
\(=\left(x+\frac{1}{2}\right)\left(x-1\right)\left(x-\frac{2}{3}\right):\left(x+\frac{1}{2}\right)\)
\(=\left(x-1\right)\left(x-\frac{2}{3}\right)\)
a) Ta có: 6x^3 - 7x2 - x+2 = 6x3+3x2-10x2-5x+4x+2
= 3x2 ( 2x+1) - 5x(2x+1) + 2(2x+1)
= (2x+1)(3x2-5x+2)
Suy ra: (6x3-7x2-x+2): (2x+1)= 3x2-5x+2
b) Ta có: x2 -y2+6x+9= (x2+6x+9) - y2
= (x+3)2 - y2
= (x+3-y)(x+3+y)
Suy ra: (x2-y2+6x+9): (x+y+3)= x-y+3
Làm vậy nha pạn :)
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1.
7x(2x-1)=14x2-7x
2
a. x2+2x=x(x+2)
b.x2-xy+3x-3y
=x(x-y)+3(x-y)
=(x+3)(x-y)
Câu 2:
1. 2x/2x-5 - 5/2x-5
=2x-5/2x-5
=1
2. (6x3-7x2-x+2) : (x-1)=6x2-x-2
x^3 - x^2 - 7x + 3 x - 3 x^2 + 2x - 1 x^3 - 3x^2 2x^2 - 7x 2x^2 - 6x -x + 3 -x + 3 0
Vậy \(\left(x^3-x^2-7x+3\right):\left(x-3\right)=x^2+2x-1\)