如题所述
第1个回答 2020-01-04
99x101+99
=(100-1)x(100+1)+99
=100x100-1+99
=10000+98
=10098
204x75
=(200+4)x75
=200x75+4x75
=15000+300
=15300
=(100-1)x(100+1)+99
=100x100-1+99
=10000+98
=10098
204x75
=(200+4)x75
=200x75+4x75
=15000+300
=15300