题目内容
746-587+487
4734-(3734-159)+523-(423-141)
4734-(3734-159)+523-(423-141)
(1)746-587+487
=746-(587-487),
=746-100,
=646;
(2)4734-(3734-159)+523-(423-141)
=4734-3734+159+523-423+141,
=4734-3734+(159+141)+(523-423),
=1000+300-100,
=1200.
=746-(587-487),
=746-100,
=646;
(2)4734-(3734-159)+523-(423-141)
=4734-3734+159+523-423+141,
=4734-3734+(159+141)+(523-423),
=1000+300-100,
=1200.
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