Question

Answer 1

1,\(=\dfrac{3x-5+4x-5}{7}=\dfrac{7x}{7}=x\)

 

Answer 2

Giúp mình làm bài 3

4,5

Answer 3

3.\(=\dfrac{5x+15}{x+3}=\dfrac{5x\left(x+3\right)}{x+3}=5\)

4.\(=\dfrac{3x\left(x-7\right)}{x\left(x-7\right)}=\dfrac{3x}{x}=3\)

5.\(=\dfrac{x\left(x+2\right)^2}{3\left(x+2\right)}=\dfrac{x\left(x+2\right)}{3}\)

CÓ SAI SÓT GÌ HÃY QUA NHÉ!