题目内容
下面各题怎样算简便就怎样算.
36×199 | 0.54×1.75+8.25×0.54 | 2.5-
|
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的选择进行计算.
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的选择进行计算.
解答:解:(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-
÷
-
÷
,
=2.5-
-
,
=2.5-(
+
),
=2.5-1,
=1.5.
=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.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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