问题
解答题
下列各题,能简算的要简算.
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答案
(1)25×24,
=25×4×6,
=100×6,
=600;
(2)287+199,
=287+200-1,
=487-1,
=486;
(3)260-60÷4,
=260-15,
=245;
(4)76+(38+24),
=76+38+24,
=(76+24)+38,
=100+38,
=138;
(5)800÷25,
=800÷5÷5,
=160÷5,
=32;