如果-x=-5,那么x=?如果-a=a,那么a=?1-2+3-4+5-6+7-8+...-100+101=?-1+3-5+7-9+...-97+99=?It is a red pen in English.对a red pen 提问My computer is very new.改为一般疑问句That is a baseball.改为反问句these是?代词That is a yellow p

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