0.01-0.02+0.03-0.04+...+0.97-0.98+0.99的简便方法怎么写

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0.01-0.02+0.03-0.04+…闷冲…芹缺+0.97-0.98+0.99
=(0.99-0.98)+(0.97-0.96)+……+(0.03-0.02)+0.01
=0.01+0.01+……嫌罩辩+0.01+0.01
=0.01×(98÷2)+0.01
=0.01×49+0.01
=0.01×(49+1)
=0.01×50
=0.5

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