题目内容
计算(能简算的要简算)
(1)5÷
+
÷5
(2)
×
+40%×
(3)
+
×
÷2
(4)
÷(
-
)×
(5)3-
×
-
(6)
÷
+
×
.
(1)5÷
| 5 |
| 6 |
| 5 |
| 6 |
(2)
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
(3)
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
(4)
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
(5)3-
| 10 |
| 21 |
| 3 |
| 2 |
| 2 |
| 7 |
(6)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
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)先算除法,再算加法;
(2)运用乘法的分配律进行简算;
(3)先算乘除法,再算加法;
(4)先算小括号里的加法,再从左向右进行计算;
(5)先算乘法,再算运用减法的性质进行简算;
(6)把除以
化成乘以
,再运用乘法的分配律进行简算.
(2)运用乘法的分配律进行简算;
(3)先算乘除法,再算加法;
(4)先算小括号里的加法,再从左向右进行计算;
(5)先算乘法,再算运用减法的性质进行简算;
(6)把除以
| 11 |
| 5 |
| 5 |
| 11 |
解答:
解:(1)5÷
+
÷5
=6+
=6
;
(2)
×
+40%×
=
×(
+
)
=
×1
=
;
(3)
+
×
÷2
=
+
÷2
=
+
=
;
(4)
÷(
-
)×
=
÷
×
=
×
=
;
(5)3-
×
-
=3-
-
=3-(
+
)
=3-1
=2;
(6)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
.
| 5 |
| 6 |
| 5 |
| 6 |
=6+
| 1 |
| 6 |
=6
| 1 |
| 6 |
(2)
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(3)
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 2 |
=
| 1 |
| 6 |
| 1 |
| 4 |
=
| 5 |
| 12 |
(4)
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 5 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
(5)3-
| 10 |
| 21 |
| 3 |
| 2 |
| 2 |
| 7 |
=3-
| 5 |
| 7 |
| 2 |
| 7 |
=3-(
| 5 |
| 7 |
| 2 |
| 7 |
=3-1
=2;
(6)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:此题主要考查了分数四则混合运算,注意运算顺序,注意运算定律的灵活应用.
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