题目内容
计算
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|
1-
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0.4+
|
分析:本题根据分数加减法的运算法则及运算顺序计算即可,能简算的要简算.
(1)根据加法的交换律进行计算,先算
+
,再算减法,
(2)运用加法的交换律先算
-
,再算加法,
(3)运用加法的交换律先算
-
,再算加法,
(4)运用加法的交换律、结合律进行简算,
(5)先通分,分母都化成以10为分母的分数,再根据同分母分数的计算法则进行加法运算,
(6)先通分,再根据同分母分数的计算法则进行减法运算,
(7)先通分,再根据同分母分数的计算法则进行减法运算,
(8)先通分,先算括号里的加法,再算减法,
(9)根据减法的运算定律进行简算,
(10)先算
-
,再减去
即可,
(11)先通分,再从左向右进行计算即可,
(12)把小数化成分数,再通分进行计算即可.
(1)根据加法的交换律进行计算,先算
2 |
3 |
1 |
3 |
(2)运用加法的交换律先算
4 |
13 |
4 |
13 |
(3)运用加法的交换律先算
5 |
9 |
4 |
9 |
(4)运用加法的交换律、结合律进行简算,
(5)先通分,分母都化成以10为分母的分数,再根据同分母分数的计算法则进行加法运算,
(6)先通分,再根据同分母分数的计算法则进行减法运算,
(7)先通分,再根据同分母分数的计算法则进行减法运算,
(8)先通分,先算括号里的加法,再算减法,
(9)根据减法的运算定律进行简算,
(10)先算
9 |
7 |
2 |
7 |
2 |
9 |
(11)先通分,再从左向右进行计算即可,
(12)把小数化成分数,再通分进行计算即可.
解答:解:(1)
-
+
,
=(
+
)-
,
=1-
,
=
;
(2)
+
-
,
=
-
+
,
=0+
,
=
;
(3)
+
-
,
=
-
+
,
=
+
,
=
;
(4)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(5)
+
+
,
=
+
,
=
,
=1
;
(6)1-
-
,
=
-
,
=
;
(7)
-
-
,
=
-
,
=
;
(8)
-(
+
),
=
-
,
=
;
(9)
-
-
,
=
-(
+
),
=
-1,
=
;
(10)
-
-
,
=
-
-
,
=1-
,
=
;
(11)
-
-
,
=
-
,
=
;
(12)0.4+
=
.
2 |
3 |
1 |
6 |
1 |
3 |
=(
2 |
3 |
1 |
3 |
1 |
6 |
=1-
1 |
6 |
=
5 |
6 |
(2)
4 |
13 |
3 |
8 |
4 |
13 |
=
4 |
13 |
4 |
13 |
3 |
8 |
=0+
3 |
8 |
=
3 |
8 |
(3)
5 |
9 |
2 |
3 |
4 |
9 |
=
5 |
9 |
4 |
9 |
2 |
3 |
=
1 |
9 |
2 |
3 |
=
7 |
9 |
(4)
3 |
8 |
1 |
5 |
5 |
8 |
=(
3 |
8 |
5 |
8 |
1 |
5 |
=1+
1 |
5 |
=1
1 |
5 |
(5)
1 |
2 |
3 |
5 |
3 |
10 |
=
11 |
10 |
3 |
10 |
=
7 |
5 |
=1
2 |
5 |
(6)1-
3 |
8 |
1 |
6 |
=
5 |
8 |
1 |
6 |
=
11 |
24 |
(7)
17 |
12 |
3 |
4 |
1 |
3 |
=
2 |
3 |
1 |
3 |
=
1 |
3 |
(8)
5 |
6 |
1 |
3 |
3 |
10 |
=
5 |
6 |
19 |
30 |
=
1 |
5 |
(9)
9 |
7 |
2 |
9 |
7 |
9 |
=
9 |
7 |
2 |
9 |
7 |
9 |
=
9 |
7 |
=
2 |
7 |
(10)
9 |
7 |
2 |
9 |
2 |
7 |
=
9 |
7 |
2 |
7 |
2 |
9 |
=1-
2 |
9 |
=
7 |
9 |
(11)
5 |
6 |
1 |
10 |
1 |
15 |
=
11 |
15 |
1 |
15 |
=
2 |
3 |
(12)0.4+
1 |
3 |
11 |
15 |
点评:此题考查了分数加减乘除法的运算法则.
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