1. Calculate: $\frac{4}{7} \times 9 \frac{3}{4}+9.75 \times \frac{2}{7}+0.142857 \times 975 \%=$
1. Calculate: $\frac{4}{7} \times 9 \frac{3}{4}+9.75 \times \frac{2}{7}+0.1^{4285} \times 975 \%=9 \underline{3}-4$
【Solution】Solution: $\frac{4}{7} \times 9 \frac{3}{4}+9.75 \times \frac{2}{7}+0.14285{ }_{7} \times 975 \%$
$$
\begin{array}{l}
=\frac{4}{7} \times 9 \frac{3}{4}+9 \frac{3}{4} \times \frac{2}{7}+\frac{1}{7} \times 9 \frac{3}{4} \\
=9 \frac{3}{4} \times\left(\frac{4}{7}+\frac{2}{7}+\frac{1}{7}\right) \\
=9 \frac{3}{4} \times 1 \\
=9 \frac{3}{4}
\end{array}
$$

Therefore, the answer is: $9 \frac{3}{4}$.