题目内容
神机妙算,能简算的要简算.
-
+
+
+
+
-(
-
)
-
+
-
.
| 4 |
| 5 |
| 5 |
| 12 |
| 1 |
| 3 |
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
| 7 |
| 18 |
| 7 |
| 18 |
| 1 |
| 8 |
| 5 |
| 11 |
| 1 |
| 8 |
| 6 |
| 11 |
| 7 |
| 8 |
考点:分数的简便计算
专题: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)根据减法的性质进行简算;
(4)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)根据减法的性质进行简算;
(4)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)
-
+
-
=(
+
)-(
+
)
=1-1
=0.
| 4 |
| 5 |
| 5 |
| 12 |
| 1 |
| 3 |
=
| 23 |
| 60 |
| 1 |
| 3 |
=
| 43 |
| 60 |
(2)
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=1+1
=2;
(3)
| 7 |
| 18 |
| 7 |
| 18 |
| 1 |
| 8 |
=
| 7 |
| 18 |
| 7 |
| 18 |
| 1 |
| 8 |
=0+
| 1 |
| 8 |
=
| 1 |
| 8 |
(4)
| 5 |
| 11 |
| 1 |
| 8 |
| 6 |
| 11 |
| 7 |
| 8 |
=(
| 5 |
| 11 |
| 6 |
| 11 |
| 1 |
| 8 |
| 7 |
| 8 |
=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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