题目内容
脱式计算(能简算的要简算)
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4-
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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)按照从左向右的顺序进行计算;
(2)根据加法交换律和结合律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算;
(5)先算加法,再算减法;
(6)根据加法交换律和结合律进行简算.
(2)根据加法交换律和结合律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算;
(5)先算加法,再算减法;
(6)根据加法交换律和结合律进行简算.
解答:
解:(1)
+
+
=
+
=
;
(2)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(3)
-
-
=
-
=0;
(4)4-
-
=4-(
+
)
=4-1
=3;
(5)
-(
+
)
=
-
=
;
(6)
-
+
-
=(
+
)-(
+
)
=1-1
=0.
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 23 |
| 15 |
| 3 |
| 10 |
=
| 11 |
| 6 |
(2)
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
| 5 |
| 7 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
| 2 |
| 7 |
| 5 |
| 7 |
=1+1
=2;
(3)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 6 |
| 1 |
| 6 |
=0;
(4)4-
| 7 |
| 11 |
| 4 |
| 11 |
=4-(
| 7 |
| 11 |
| 4 |
| 11 |
=4-1
=3;
(5)
| 9 |
| 10 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 9 |
| 10 |
| 5 |
| 6 |
=
| 1 |
| 15 |
(6)
| 2 |
| 9 |
| 3 |
| 4 |
| 7 |
| 9 |
| 1 |
| 4 |
=(
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=1-1
=0.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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