Question

Chủ đề 1: Thực hiện phép tính

1) (2x+3).(2x-3)-4x.(x+5)      

2) 6/x² -  9 + 5/x-3 + 1/x+3 

3)5x.(x-3)+(x-2)²

4) 4x/x+2 - 3x/x-2 + 12x/ x² - 4

5) x(x+2) - ( x-3)(x+3)

6) 1/3x-2 + -4/3+2 + 6-3x/9x² - 4

7)2x.(3x-1)+(x+2)² 

8) 6/x+3 - 6/x-3 + 9x+9/x² - 9

9) (2x - 5)² - x(4x-13)

10) x-1/x + 4/x+8 + 8/x² + 8x

11) (2x+1)² + (x-5)(x+5)-x(5x+7)

12) 6/x²-9 + 5/x-3 + 1/x+3

13) 6x(5x-2)+(2x+3)²

14) x/x-2 + -2/x-3 + x(1-x)/x²-9

15) (x-2)²-x(x+5)

16) 2/x+3 + 3/x-3 + -6/x²-9

17) 3x(x-3) + (3x-1)²

Answer 1

Chia nhỏ ra ik ạ

Answer 2

\(\left(2x+3\right)\left(2x-3\right)-4x\left(x+5\right)=4x^2-9-4x^2-20x=-20x-9\)

\(5x\left(x-3\right)+\left(x-2\right)^2=5x^2-15x+x^2-4x+4=6x^2-19x+4\)

\(x\left(x+2\right)-\left(x-3\right)\left(x+3\right)=x^2+2x-\left(x^2-9\right)=x^2+2x-x^2+9=2x+9\)