题目内容
(2005?高县)简便计算.
3.72-(1.72+1.3)49×101
-
+
-
.
3.72-(1.72+1.3)49×101
1 |
14 |
9 |
10 |
13 |
14 |
1 |
10 |
分析:(1)运用减法的性质进行简算;
(2)把101看作100+1,运用乘法分配律进算;
(3)运用加法交换律和结合律简算.
(2)把101看作100+1,运用乘法分配律进算;
(3)运用加法交换律和结合律简算.
解答:解:(1)3.72-(1.72+1.3),
=(3.72-1.72)-1.3,
=2-1.3,
=0.7;
(2)49×101,
=49×(100+1),
=4900+49,
=4949;
(3)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0.
=(3.72-1.72)-1.3,
=2-1.3,
=0.7;
(2)49×101,
=49×(100+1),
=4900+49,
=4949;
(3)
1 |
14 |
9 |
10 |
13 |
14 |
1 |
10 |
=(
1 |
14 |
13 |
14 |
9 |
10 |
1 |
10 |
=1-1,
=0.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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