a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a

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a=-1求a-2a+3a-4a+5a-6a+...+99a-100aa=-1求a-2a+3a-4a+5a-6a+...+99a-100aa=-1求a-2a+3a-4a+5a-6a+...+99a-10

a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a

a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a-2a+3a-4a+5a-6a+...+99a-100a
=a﹙1-2+3-4+···+99-100﹚
=-50a
=50

a-2a+3a-4a+5a-6a+...+99a-100a
=-50a
=50

50

50