72×18的简便运算
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![72×18的简便运算](/uploads/image/z/201263-23-3.jpg?t=72%C3%9718%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
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72×18的简便运算
72×18的简便运算
72×18的简便运算
72×18
=72×(20-2)
=72×20-72×2
=1440-144
=1296
72×18=(70+2)×18=70×18+2×18
72×18=(70+2)×18=1260+36=1296
或72×(20-2)=1440-144=1296