问题
解答题
下面各题怎样算简便就怎样算.
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答案
(1)36×199,
=36×(200-1),
=36×200-36×1,
=7200-36,
=7164;
(2)0.54×1.75+8.25×0.54,
=0.54×(1.75+8.25),
=0.54×10,
=5.4;
(3)2.5-
÷1 2
-4 7
÷1 16
,1 2
=2.5-
-7 8
,1 8
=2.5-(
+7 8
),1 8
=2.5-1,
=1.5.