321×98-320×97简便运算附有答案

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321×98-320×97简便运算附有答案
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321×98-320×97简便运算附有答案
321×98-320×97简便运算附有答案

321×98-320×97简便运算附有答案
321*98-320*97=320*98-320*97+98=320+98=418

(320+1)(97+1)-320*97=320+97+1=418

321×98-320×97
=(320+1)×98-320×97
=320×98+1×98-320×97
=320×98-320×97+98
=320×(98-97)+98
=320+98
=418