救救我,一道超难奥数题!15.6*78-15.6*14-64*5.
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救救我,一道超难奥数题!15.6*78-15.6*14-64*5.
救救我,一道超难奥数题!
15.6*78-15.6*14-64*5.
救救我,一道超难奥数题!15.6*78-15.6*14-64*5.
=15.6*(78-14)-64*5.6
=15.6*64-64*5.6
=(15.6-5.6)*64
=10*64
=640
=15.6*(78-14)-64*5.6
=64*(15.6-5.6)
=640
你很无聊