如题所述
第1个回答 2010-12-30
变换式子：
（100-1）*121
=100*121-121
=12100-121
=11979
（100-1）*121
=100*121-121
=12100-121
=11979
第2个回答 2010-12-30
99*121
=(100-1)x121
=100x121-1x121
=12100-121
=12100-100-21
=12000-21
=11979本回答被提问者和网友采纳
=(100-1)x121
=100x121-1x121
=12100-121
=12100-100-21
=12000-21
=11979本回答被提问者和网友采纳
第3个回答 2010-12-30
99×121
=100×121-1×121
=12100-121
=12000-21
=11979
=100×121-1×121
=12100-121
=12000-21
=11979
第4个回答 2010-12-30
99*121
=11*33^2
=11*33^2
