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用自己喜欢的方法计算5-21417

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用自己喜欢的方法计算
5-2
14
17
用自己喜欢的方法计算5-21417
(1)5-2
14
17-1
3
17,
=5-(2
14
17+
3
17),
=5-3,
=2;
(2)71×99,
=71×(100-1),
=71×100-71,
=7100-71,
=7029;
(3)0.625×0.5+
5
8+
1
2×62.5%,
=0.625×0.5+0.625+0.5×0.625,
=0.625×(0.5+0.5+1),
=0.625×2,
=1.25;
(4)8.37-3.25-(1.37+1.75),
=8.37-1.37-(3.25+1.75),
=7-5,
=2;
(5)45×(
7
9+
4
15-0.6),
=45×
7
9+45×
4
15-45×0.6,
=35+12-27,
=20;
(6)0.25×48,
=(0.25×4)×12,
=1×12,
=12.