题目内容
用你喜欢的方法计算
+
+
-
;
-(
+
);
+8×(
-
).
| 1 |
| 8 |
| 8 |
| 15 |
| 7 |
| 8 |
| 3 |
| 15 |
| 11 |
| 12 |
| 1 |
| 12 |
| 1 |
| 8 |
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
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)运用加法的交换律,减法的性质进行简算;
(2)先去括号,再从左向右进行计算;
(3)先根据乘法的分配律进行简算,再从左向右进行计算.
(2)先去括号,再从左向右进行计算;
(3)先根据乘法的分配律进行简算,再从左向右进行计算.
解答:
解:(1)
+
+
-
=
+
+
-
=(
+
)+(
-
)
=1+
=1
;
(2)
-(
+
)
=
-
-
=
-
=
;
(3)
+8×(
-
)
=
+7-
=7
-
=1.
| 1 |
| 8 |
| 8 |
| 15 |
| 7 |
| 8 |
| 3 |
| 15 |
=
| 1 |
| 8 |
| 7 |
| 8 |
| 8 |
| 15 |
| 3 |
| 15 |
=(
| 1 |
| 8 |
| 7 |
| 8 |
| 8 |
| 15 |
| 3 |
| 15 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
(2)
| 11 |
| 12 |
| 1 |
| 12 |
| 1 |
| 8 |
=
| 11 |
| 12 |
| 1 |
| 12 |
| 1 |
| 8 |
=
| 5 |
| 6 |
| 1 |
| 8 |
=
| 17 |
| 24 |
(3)
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 20 |
| 3 |
=7
| 2 |
| 3 |
| 20 |
| 3 |
=1.
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.
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