题目内容
63×(
+
)
×
+
÷
×〔
-(
-
)〕
| 4 |
| 9 |
| 5 |
| 7 |
| 3 |
| 5 |
| 5 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
| 7 |
| 12 |
| 1 |
| 4 |
分析:(1)运用乘法的分配律计算会更加简便.
(2)按照先算乘除后算加减的运算顺序进行计算.
(3)按照先计算中括号内部的再计算中括号外面的运算顺序进行计算.
(2)按照先算乘除后算加减的运算顺序进行计算.
(3)按照先计算中括号内部的再计算中括号外面的运算顺序进行计算.
解答:解:(1)63×(
+
),
=63×
+63×
,
=28+45,
=73;
(2)
×
+
÷
,
=
+
×
,
=
+
,
=
;
(3)
×[
-(
-
)],
=
×[
-(
-
)],
=
×[
-
],
=
×
,
=
.
| 4 |
| 9 |
| 5 |
| 7 |
=63×
| 4 |
| 9 |
| 5 |
| 7 |
=28+45,
=73;
(2)
| 3 |
| 5 |
| 5 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
=
| 1 |
| 2 |
| 1 |
| 6 |
| 5 |
| 3 |
=
| 9 |
| 18 |
| 5 |
| 18 |
=
| 7 |
| 9 |
(3)
| 2 |
| 5 |
| 3 |
| 4 |
| 7 |
| 12 |
| 1 |
| 4 |
=
| 2 |
| 5 |
| 3 |
| 4 |
| 7 |
| 12 |
| 3 |
| 12 |
=
| 2 |
| 5 |
| 9 |
| 12 |
| 4 |
| 12 |
=
| 2 |
| 5 |
| 5 |
| 12 |
=
| 1 |
| 6 |
点评:本题主要考查了运算定律的运用及运算顺序的掌握情况.
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