(4/7+3/7) :100=

To solve the expression \((\frac{4}{7} + \frac{3}{7}) : 100\), we first simplify the part inside the parentheses:

\[ \frac{4}{7} + \frac{3}{7} = \frac{4 + 3}{7} = \frac{7}{7} = 1 \]

Now, we can rewrite the expression as:

\[ 1 : 100 \]

Dividing 1 by 100 gives:

\[ 1 : 100 = \frac{1}{100} = 0.01 \]

So, the final answer is:

\[ \boxed{0.01} \]