1+2+3+.....+99
=1+2+3+....+99+100-100
=(1+100)*100/2-100
=101*50-100
=5050-100
=4950
1加到99等于4950
1+2+......+99
=(1+99)×99÷2
=4950
1+2+3+…+99
=(1+99)x99÷2
=100x99÷2
=4950
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