1.01+2.02+3.03+…+98.98+99.99
=1·01×1＋1·01×1×2＋1·01×3＋····＋1·01×98＋1·01×1×99
=1·01×(1＋2＋3＋····＋99)
=1·01×(1＋99)×99÷2
=1·01×100×99÷2
=1·01×50×99
=50·5×99
=50·5×(100－1)
=50·5×100－50·5×1
=5050－50·1
=5050－50－0·1
=5000－0·1
=4999·9
简算1.01+2.02+3.03+…+98.98+99.99等余多少?