题目内容
计算下列各题,能简算的要简算
×7+
+
+
-
×
+
÷
×5÷
×5.
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 12 |
| 11 |
| 26 |
| 15 |
| 26 |
| 1 |
| 12 |
| 7 |
| 18 |
| 1 |
| 4 |
| 3 |
| 4 |
| 18 |
| 7 |
| 3 |
| 5 |
| 3 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)运用乘法分配律解答,
(2)运用加法交换律和结合律解答,
(4)按照从左到右顺序计算解答.
(2)运用加法交换律和结合律解答,
(4)按照从左到右顺序计算解答.
解答:
解:(1)
×7+
=(1+7)×
=8×
=7;
(2)
+
+
-
=(
-
)+(
+
)
=
+1
=1
;
(3)
×
+
÷
=
×(
+
)
=
×1
=
;
(4)
×5÷
×5
=3÷
×5
=5×5
=25.
| 7 |
| 8 |
| 7 |
| 8 |
=(1+7)×
| 7 |
| 8 |
=8×
| 7 |
| 8 |
=7;
(2)
| 7 |
| 12 |
| 11 |
| 26 |
| 15 |
| 26 |
| 1 |
| 12 |
=(
| 7 |
| 12 |
| 1 |
| 12 |
| 11 |
| 26 |
| 15 |
| 26 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
(3)
| 7 |
| 18 |
| 1 |
| 4 |
| 3 |
| 4 |
| 18 |
| 7 |
=
| 7 |
| 18 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 7 |
| 18 |
=
| 7 |
| 18 |
(4)
| 3 |
| 5 |
| 3 |
| 5 |
=3÷
| 3 |
| 5 |
=5×5
=25.
点评:本题主要考查学生依据四则运算计算方法正确进行计算,以及正确运用简便方法解决问题的能力.
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