99...9*99...9+199...9 1998个9 1998个9 1998个9

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/01 14:57:50
99...9*99...9+199...9 1998个9 1998个9 1998个9
x)ӳԂPچZH[<ٱ &HtMv6ddD[36QMZ(Q,ediBD!=Ɩf@s /.H̳9 (XL

99...9*99...9+199...9 1998个9 1998个9 1998个9
99...9*99...9+199...9 1998个9 1998个9 1998个9

99...9*99...9+199...9 1998个9 1998个9 1998个9
令a=1998个9
则原式=a²+2a+1
=(a+1)²
=100……0,(3996个0)