题目内容
脱式计算,能简算的要简算.
4-
-
+
+
-
+
.
4-
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 5 |
| 3 |
| 8 |
| 4 |
| 5 |
| 7 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
考点:分数的加法和减法,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)根据减法的性质计算;
(2)先算同分母分数,再相加;
(3)先通分再计算.
(2)先算同分母分数,再相加;
(3)先通分再计算.
解答:
解:(1)4-
-
=4-(
+
)
=4-1
=3
(2)
+
+
=
+
+
=1+
=1
(3)
-
+
=
-
+
=
.
| 1 |
| 6 |
| 5 |
| 6 |
=4-(
| 1 |
| 6 |
| 5 |
| 6 |
=4-1
=3
(2)
| 1 |
| 5 |
| 3 |
| 8 |
| 4 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 5 |
| 3 |
| 8 |
=1+
| 3 |
| 8 |
=1
| 3 |
| 8 |
(3)
| 7 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 14 |
| 18 |
| 12 |
| 18 |
| 15 |
| 18 |
=
| 17 |
| 18 |
点评:考查了分数的加法和减法和运算定律与简便运算,关键是灵活运用运算定律简便运算.
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