题目内容
计算下面各题
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7-
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1-
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考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)、(2)、(3)、(4)、(5)根据异分母分数加减法的计算方法进行计算;
(6)、(7)根据同分母分数加法的计算方法进行计算;
(8)根据减法的性质进行简算.
(6)、(7)根据同分母分数加法的计算方法进行计算;
(8)根据减法的性质进行简算.
解答:
解:(1)
+
=
+
=
;
(2)
-
=
-
=
;
(3)
+
=
+
=
;
(4)
-
=
-
=
;
(5)7-
=6+
-
=6+
=6
;
(6)
+
+
=
=
;
(7)
+
+
=
=
;
(8)1-
-
=1-(
+
)
=1-1
=0.
| 1 |
| 6 |
| 1 |
| 4 |
=
| 2 |
| 12 |
| 3 |
| 12 |
=
| 5 |
| 12 |
(2)
| 5 |
| 7 |
| 1 |
| 5 |
=
| 25 |
| 35 |
| 7 |
| 35 |
=
| 18 |
| 35 |
(3)
| 3 |
| 7 |
| 1 |
| 9 |
=
| 27 |
| 63 |
| 7 |
| 63 |
=
| 34 |
| 63 |
(4)
| 1 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 15 |
| 3 |
| 15 |
=
| 2 |
| 15 |
(5)7-
| 5 |
| 7 |
=6+
| 7 |
| 7 |
| 5 |
| 7 |
=6+
| 2 |
| 7 |
=6
| 2 |
| 7 |
(6)
| 1 |
| 14 |
| 5 |
| 14 |
| 3 |
| 14 |
=
| 1+5+3 |
| 14 |
=
| 9 |
| 14 |
(7)
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 1+1+3 |
| 4 |
=
| 5 |
| 4 |
(8)1-
| 2 |
| 3 |
| 1 |
| 3 |
=1-(
| 2 |
| 3 |
| 1 |
| 3 |
=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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