题目内容
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| 8-
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)运用加法的交换律、减法的性质进行简算;
(2)先算减法,再算加法;
(3)从左向右进行计算即可;
(4)从左向右进行计算即可;
(5)运用加法的交换律、结合律进行简算;
(6)运用减法的性质进行简算;
(7)先算小括号里的减法,再算括号外的减法.
(2)先算减法,再算加法;
(3)从左向右进行计算即可;
(4)从左向右进行计算即可;
(5)运用加法的交换律、结合律进行简算;
(6)运用减法的性质进行简算;
(7)先算小括号里的减法,再算括号外的减法.
解答:
解:(1)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(2)
+
-
=
-
+
=0+
=
;
(3)
+
-
=
-
=
;
(4)
-
+
=
+
=
;
(5)
+
+
+
=
+
+
+
=(
+
)+(
+
)
=
+
=
;
(6)8-
-
=8-(
+
)
=8-1
=7;
(7)
-(
-
)
=
-
=
.
| 5 |
| 6 |
| 3 |
| 10 |
| 1 |
| 6 |
| 7 |
| 10 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
| 3 |
| 10 |
| 7 |
| 10 |
=1-1
=0;
(2)
| 5 |
| 7 |
| 1 |
| 4 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 4 |
=0+
| 1 |
| 4 |
=
| 1 |
| 4 |
(3)
| 3 |
| 5 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 19 |
| 15 |
| 5 |
| 6 |
=
| 13 |
| 30 |
(4)
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
=
| 11 |
| 24 |
| 1 |
| 6 |
=
| 5 |
| 8 |
(5)
| 1 |
| 5 |
| 1 |
| 8 |
| 1 |
| 5 |
| 1 |
| 8 |
=
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 8 |
| 1 |
| 8 |
=(
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 2 |
| 5 |
| 1 |
| 4 |
=
| 13 |
| 20 |
(6)8-
| 1 |
| 4 |
| 3 |
| 4 |
=8-(
| 1 |
| 4 |
| 3 |
| 4 |
=8-1
=7;
(7)
| 5 |
| 8 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 5 |
| 8 |
| 1 |
| 6 |
=
| 11 |
| 24 |
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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