问题
解答题
计算下面各题.(能简便的要用简便方法计算)
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答案
(1)35+138+65,
=(35+65)+138,
=100+138,
=238;
(2)17×(130-60),
=17×70,
=1190;
(3)45×12,
=45×(2×6),
=(45×2)×6,
=90×6,
=540;
(4)243-34-66,
=243-(34+66),
=243-100,
=143;
(5)25×36,
=25×(4×9),
=(25×4)×9,
=100×9,
=900;
(6)540÷15÷4,
=540÷(15×4),
=540÷60,
=9.