题目内容
计算下面各题,能简算的要简算.
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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)运用加法结合律解答,
(2)按照先算括号里面的,在算括号外面的顺序计算解答,
(3)按照从左到右顺序计算解答,
(4)运用加法交换律和结合律解答,
(5)运用减法性质解答,
(6)运用加法交换律解答.
(2)按照先算括号里面的,在算括号外面的顺序计算解答,
(3)按照从左到右顺序计算解答,
(4)运用加法交换律和结合律解答,
(5)运用减法性质解答,
(6)运用加法交换律解答.
解答:
解:(1)
+
+
=
+(
+
)
=
+1
=1
;
(2)
+(
+
)
=
+
=2
;
(3)
-
+
=
+
=
;
(4)
+
+
+
=(
+
)+(
+
)
=1+
=1
;
(5)
-(
+
)
=
-
-
=
-
=0;
(6)
+
+
=(
+
)+
=1+
=1
.
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
=1
| 1 |
| 6 |
(2)
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
=
| 23 |
| 28 |
| 17 |
| 14 |
=2
| 1 |
| 28 |
(3)
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 12 |
| 1 |
| 3 |
=
| 11 |
| 12 |
(4)
| 11 |
| 12 |
| 5 |
| 8 |
| 1 |
| 8 |
| 1 |
| 12 |
=(
| 11 |
| 12 |
| 1 |
| 12 |
| 5 |
| 8 |
| 1 |
| 8 |
=1+
| 3 |
| 4 |
=1
| 3 |
| 4 |
(5)
| 7 |
| 9 |
| 1 |
| 3 |
| 4 |
| 9 |
=
| 7 |
| 9 |
| 4 |
| 9 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 3 |
=0;
(6)
| 3 |
| 20 |
| 8 |
| 15 |
| 17 |
| 20 |
=(
| 3 |
| 20 |
| 17 |
| 20 |
| 8 |
| 15 |
=1+
| 8 |
| 15 |
=1
| 8 |
| 15 |
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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