题目内容
“步步成功”我能行.
-
+
+
+
2-
-
-﹙
-
﹚
-
+
-
.
| 2 |
| 5 |
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 9 |
| 5 |
| 6 |
| 2 |
| 9 |
| 5 |
| 11 |
| 6 |
| 11 |
| 5 |
| 6 |
| 3 |
| 4 |
| 3 |
| 8 |
| 5 |
| 9 |
| 3 |
| 7 |
| 4 |
| 9 |
| 4 |
| 7 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)(3)运用减法的性质计算.
(2)(5)运用加法交换律与结合律简算.
(4)先算括号内的,再算括号外的.
(2)(5)运用加法交换律与结合律简算.
(4)先算括号内的,再算括号外的.
解答:
解:(1)5-
+
=5-(
-
)
=5-
=4
(2)
+
+
=(
+
)+
=1+
=1
(3)2-
-
=2-(
+
)
=2-1
=1
(4)
-(
-
)
=
-
=
(5)
-
+
-
=(
+
)-(
+
)
=1-1
=0
| 1 |
| 3 |
| 1 |
| 4 |
=5-(
| 1 |
| 3 |
| 1 |
| 4 |
=5-
| 1 |
| 12 |
=4
| 11 |
| 12 |
(2)
| 7 |
| 9 |
| 5 |
| 6 |
| 2 |
| 9 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 6 |
=1+
| 5 |
| 6 |
=1
| 5 |
| 6 |
(3)2-
| 5 |
| 11 |
| 6 |
| 11 |
=2-(
| 5 |
| 11 |
| 6 |
| 11 |
=2-1
=1
(4)
| 5 |
| 6 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 8 |
=
| 11 |
| 24 |
(5)
| 5 |
| 9 |
| 3 |
| 7 |
| 4 |
| 9 |
| 4 |
| 7 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 3 |
| 7 |
| 4 |
| 7 |
=1-1
=0
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用运算定律简算.
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