如何简算2+4+8+16+32+64+……+1048576=?
1个回答

2+4+8+16+32+64+……+1048576

=2+2+4+8+16+32+64+……+1048576-2

=4+4+8+16+32+64+……+1048576-2

=8+8+16+32+64+……+1048576-2

=……

=1048576+1048576-2

=2097152-2

=2097150