Question

Phân tích thành nhân tử 

1) 5x-5y+x(x-y)

2) x^2+4x+3

3) x^2-2xy+y^2-z^2

4) x(x-5)-3x+15

5) y^2-x^2+2x-1

6) 7x^2y+14y+7

7) x^3+x^2-4x-4

8) x^2-2x-15

9) x^2+3y-5

10) 2xy+z+2x+yz

Answer 1

1)

5x - 5y + x ( x - y ) = (x-y)(5+x)

2)

x²+4x+3=x²+x+3x+3=(x+1)(x+3)

3)x²-2xy+y²-z²=\(\left(x-y\right)^2-z^2=\left(x-y-z\right)\left(x-y+z\right)\)

Answer 2

4)\(x\left(x-5\right)-3x+15=\left(x-3\right)\left(x-5\right)\)

Answer 3

tt thôi nha dài lắmTruong minh quan cái này dễ mà cũng hỏi