2-22-23-24-25-26-27-28-29+210.
问题描述:
2-22-23-24-25-26-27-28-29+210.
答
设S=22+23+24+25+26+27+28+29,
则2S=23+24+25+26+27+28+29+210,
∴2S-S=210-22,即S=210-4,
∴原式=2-(210-4)+210
=6.