题目内容
能简算的要简算
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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)先算小括号里面的减法,再算括号外面的减法;
(2)先算减法,再算加法;
(3)先算加法,再算减法;
(4)根据加法交换律和结合律进行简算;
(5)根据减法的性质进行简算;
(6)根据加法交换律和结合律进行简算.
(2)先算减法,再算加法;
(3)先算加法,再算减法;
(4)根据加法交换律和结合律进行简算;
(5)根据减法的性质进行简算;
(6)根据加法交换律和结合律进行简算.
解答:
解:(1)
-(
-
)
=
-
=
;
(2)
+(
-
)
=
+
=
;
(3)
-(
+
)
=
-
=
;
(4)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(5)
-
-
=
-(
+
)
=
-1
=
;
(6)
-
+
-
=(
+
)-(
+
)
=1-1
=0.
11 |
12 |
3 |
4 |
1 |
2 |
=
11 |
12 |
1 |
4 |
=
2 |
3 |
(2)
6 |
7 |
1 |
2 |
3 |
14 |
=
6 |
7 |
2 |
7 |
=
8 |
7 |
(3)
8 |
9 |
2 |
9 |
1 |
3 |
=
8 |
9 |
5 |
9 |
=
1 |
3 |
(4)
4 |
9 |
1 |
6 |
5 |
6 |
5 |
9 |
=(
4 |
9 |
5 |
9 |
1 |
6 |
5 |
6 |
=1+1
=2;
(5)
17 |
3 |
3 |
8 |
5 |
8 |
=
17 |
3 |
3 |
8 |
5 |
8 |
=
17 |
3 |
=
14 |
3 |
(6)
7 |
8 |
3 |
4 |
1 |
8 |
1 |
4 |
=(
7 |
8 |
1 |
8 |
3 |
4 |
1 |
4 |
=1-1
=0.
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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