Question

8+7+8+9+57+7777778+9797

Answer 1

That would be..
32+57+7777778+9797
89+7777778+9797
9886+7777778
=7787664

Answer 2

$7777778 \\ 0009797 \\ 0000066 \\ 0000023 \\ = = = = = = \\778766 4$