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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