题目内容
计算题:
(1)0.125×7.37+
×3.63-12.5×0.1
(2)1
×(2
-
)+
÷
(3)(4
-
+26)÷
×
(4)246×
:
(1)0.125×7.37+
1 |
8 |
(2)1
4 |
17 |
2 |
3 |
3 |
4 |
11 |
12 |
17 |
21 |
(3)(4
7 |
8 |
13 |
16 |
13 |
16 |
1 |
74 |
(4)246×
345345345345 |
123123123123 |
分析:(1)、(2)、(3)运用乘法分配律解答,
(4)化345345345345=345×1001001001,123123123123=123×1001001001解答.
(4)化345345345345=345×1001001001,123123123123=123×1001001001解答.
解答:解:(1)0.125×7.37+
×3.63-12.5×0.1,
=0.125×(7.37+3.63-10),
=0.125×1,
=0.125;
(2)1
×(2
-
)+
÷
,
=
×
+
×
,
=
×(
+
),
=
×
,
=3.5;
(3))(4
-
+26)÷
×
,
=(
×
-
×
+26×
)×
,
=(6-1+32)×
,
=37×
,
=0.5;
(4)246×
,
=246×
,
=246×
,
=690.
1 |
8 |
=0.125×(7.37+3.63-10),
=0.125×1,
=0.125;
(2)1
4 |
17 |
2 |
3 |
3 |
4 |
11 |
12 |
17 |
21 |
=
21 |
17 |
23 |
12 |
11 |
12 |
21 |
17 |
=
21 |
17 |
23 |
12 |
11 |
12 |
=
21 |
17 |
34 |
12 |
=3.5;
(3))(4
7 |
8 |
13 |
16 |
13 |
16 |
1 |
74 |
=(
39 |
8 |
16 |
13 |
13 |
16 |
16 |
13 |
16 |
13 |
1 |
74 |
=(6-1+32)×
1 |
74 |
=37×
1 |
74 |
=0.5;
(4)246×
345345345345 |
123123123123 |
=246×
1001001001×345 |
1001001001×123 |
=246×
345 |
123 |
=690.
点评:在计算题中正确的运用简便算法可以使计算更简单.
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