99*98=(98+1)98=98*98+98=9702我不知道这二个算不算简便计算嘿嘿
99*98=(100-1)*98=9800-98=9700+100-98=9700+2=9702
99×98=﹙100-1﹚×98=9800-100+2=9702
99x98=(100-1)x98=100x98-1x98=9800-98=9702
(100-1)*(100-98)=9702