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](/uploads/image/z/1083698-26-8.jpg?t=321%C3%9798-320%C3%9797%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E9%99%84%E6%9C%89%E7%AD%94%E6%A1%88)
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