Please bantu semuanya ya please banget

1. 3/3x + 1/3x = 4/3x
2. 5(x+3)/15 + 3(x+5)/15
= 5x + 15/15 + 3x + 15/15
= 8x + 30/15 
3. 5(x+4)/x^2+7x+12 - 6(x+3)/x^2+7x+12
= 5x+20/x^2+7x+12 - 6x-18/x^2+7x+12
= -x + 2/x^2+7x+12

1. [tex]\frac{1}{x}+\frac{1}{3x}=\frac{3}{3x}+\frac{1}{3x}=\frac{3+1}{3x}=\frac{4}{3x}[/tex]

2. [tex]\frac{x+3}{3}+\frac{x+5}{5}=\frac{5(x+3)+3(x+5)}{3*5}[/tex]
[tex]=\frac{5x+15+3x+15}{15}[/tex]
[tex]=\frac{1}{15}(8x+15)[/tex]

3. [tex]\frac{5}{x+3}-\frac{6}{x+4}=\frac{5(x+4)-6(x+3)}{(x+3)(x+4)}[/tex]
[tex]=\frac{5x+20-6x-18}{(x+3)(x+4)}[/tex]
[tex]=\frac{-x+2}{(x+3)(x+4)}[/tex]