题目内容
计算
(1)1.4÷
-1
÷(1.8-
)
(2)12×(
+
-
)
(3)13×
+0.34×
+13×
+
×0.34
(4)
.
(1)1.4÷
| 4 |
| 7 |
| 1 |
| 5 |
| 1 |
| 5 |
(2)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
(3)13×
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
(4)
| 275+326×274 |
| 275×326-51 |
分析:(1)依据四则运算顺序:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,
(2)(3)运用乘法分配律解答,
(4)把分母中的275×326,运用乘法分配律化简后即可解答.
(2)(3)运用乘法分配律解答,
(4)把分母中的275×326,运用乘法分配律化简后即可解答.
解答:解:(1)1.4÷
-1
÷(1.8-
),
=1.4÷
-1
÷1.6,
=2.45-0.75,
=1.7;
(2)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1;
(3)13×
+0.34×
+13×
+
×0.34,
=13×(
+
)+0.34×(
+
),
=13×1+0.34×1,
=13+0.34,
=13.34;
(4)
,
=
,
=
,
=
,
=1.
| 4 |
| 7 |
| 1 |
| 5 |
| 1 |
| 5 |
=1.4÷
| 4 |
| 7 |
| 1 |
| 5 |
=2.45-0.75,
=1.7;
(2)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=1;
(3)13×
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
=13×(
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=13×1+0.34×1,
=13+0.34,
=13.34;
(4)
| 275+326×275 |
| 275×326-51 |
=
| 275+326×274 |
| (274+1)×326-51 |
=
| 275+326×274 |
| 274×326+326-51 |
=
| 275+326×274 |
| 274×326+275 |
=1.
点评:本题考查知识点:(1)依据四则运算顺序正确进行计算,(2)正确运用简便算法解决问题.
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