问题
解答题
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答案
(1)14+15+16+17+18+19+20+21,
=(14+21)+(15+20)+(16+19)+(17+18),
=35×4,
=140;
(2)1233+1266+34,
=1233+(1266+34),
=1233+1300,
=2533.
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(1)14+15+16+17+18+19+20+21,
=(14+21)+(15+20)+(16+19)+(17+18),
=35×4,
=140;
(2)1233+1266+34,
=1233+(1266+34),
=1233+1300,
=2533.