题目内容
计算,能简算的要简算
×
+
+
+
×
+
÷[(
-
)×4]
×
+
÷4
÷
-
÷
(
-
)÷
.
| 2 |
| 3 |
| 7 |
| 3 |
| 4 |
| 5 |
| 4 |
| 9 |
| 6 |
| 7 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
| 8 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 8 |
| 8 |
| 9 |
| 3 |
| 8 |
| 8 |
| 9 |
(
| 5 |
| 18 |
| 5 |
| 24 |
| 5 |
| 6 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算乘法,再运用加法的交换律进行简算;
(2)先算乘法,再运用加法的交换律进行简算;
(3)先算小括号里的减法,再算中括号里的乘法,最后算括号外的除法;
(4)把除以4化成乘以
,再运用乘法的分配律进行简算;
(5)把除法化成乘法,运用乘法的分配律进行简算;
(6)把除法化成乘法,运用乘法的分配律进行简算.
(2)先算乘法,再运用加法的交换律进行简算;
(3)先算小括号里的减法,再算中括号里的乘法,最后算括号外的除法;
(4)把除以4化成乘以
| 1 |
| 4 |
(5)把除法化成乘法,运用乘法的分配律进行简算;
(6)把除法化成乘法,运用乘法的分配律进行简算.
解答:
解:(1)
×
+
+
=
+
+
=
+
+
=2+
=2
;
(2)
+
×
+
=
+(
+
)
=
+1
=1
;
(3)
÷[(
-
)×4]
=
÷[
×4]
=
÷
=
;
(4)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×1
=
;
(5)
÷
-
÷
=
×
-
×
=(
-
)×
=
×
=
;
(6)(
-
)÷
=(
-
)×
=
×
-
×
=
-
=
.
| 2 |
| 3 |
| 7 |
| 3 |
| 4 |
| 5 |
| 4 |
| 9 |
=
| 14 |
| 9 |
| 4 |
| 5 |
| 4 |
| 9 |
=
| 14 |
| 9 |
| 4 |
| 9 |
| 4 |
| 5 |
=2+
| 4 |
| 5 |
=2
| 4 |
| 5 |
(2)
| 6 |
| 7 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
=
| 6 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 6 |
| 7 |
=1
| 6 |
| 7 |
(3)
| 8 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 1 |
| 12 |
=
| 8 |
| 9 |
| 1 |
| 3 |
=
| 8 |
| 3 |
(4)
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
(5)
| 7 |
| 8 |
| 8 |
| 9 |
| 3 |
| 8 |
| 8 |
| 9 |
=
| 7 |
| 8 |
| 9 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=(
| 7 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=
| 1 |
| 2 |
| 9 |
| 8 |
=
| 9 |
| 16 |
(6)(
| 5 |
| 18 |
| 5 |
| 24 |
| 5 |
| 6 |
=(
| 5 |
| 18 |
| 5 |
| 24 |
| 6 |
| 5 |
=
| 5 |
| 18 |
| 6 |
| 5 |
| 5 |
| 24 |
| 6 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 12 |
点评:本题主要考查学生依据四则运算计算方法,以及正确选择简便算法解决问题的能力.
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