题目内容
计算
3-
|
|
| ||||||||||||||||||
|
|
3-(
|
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)运用减法的性质进行简算;
(2)运用加法的交换律,减法的性质进行简算;
(3)先算小括号里的减法,再算括号外的减法;
(4)从左向右进行计算;
(5)先算小括号里的减法,再算括号外的加法;
(6)先算小括号里的加法法,再算括号外的减法.
(2)运用加法的交换律,减法的性质进行简算;
(3)先算小括号里的减法,再算括号外的减法;
(4)从左向右进行计算;
(5)先算小括号里的减法,再算括号外的加法;
(6)先算小括号里的加法法,再算括号外的减法.
解答:
解:(1)3-
-
=3-(
+
)
=3-1
=2;
(2)
+
+
-
=(
+
)+(
-
)
=1+
=1
;
(3)
-(
-
)
=
-
=
;
(4)
+
-
=
-
=
;
(5)
+(
-
)
=
+
=
;
(6)3-(
+
)
=3-
=
.
| 3 |
| 7 |
| 4 |
| 7 |
=3-(
| 3 |
| 7 |
| 4 |
| 7 |
=3-1
=2;
(2)
| 3 |
| 10 |
| 6 |
| 13 |
| 7 |
| 10 |
| 5 |
| 13 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
| 6 |
| 13 |
| 5 |
| 13 |
=1+
| 1 |
| 13 |
=1
| 1 |
| 13 |
(3)
| 11 |
| 12 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 11 |
| 12 |
| 1 |
| 6 |
=
| 3 |
| 4 |
(4)
| 7 |
| 9 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 29 |
| 18 |
| 2 |
| 3 |
=
| 17 |
| 18 |
(5)
| 2 |
| 5 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 2 |
| 5 |
| 1 |
| 2 |
=
| 9 |
| 10 |
(6)3-(
| 5 |
| 12 |
| 3 |
| 4 |
=3-
| 7 |
| 6 |
=
| 11 |
| 6 |
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,灵活运用所学的运算律简便计算.
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