题目内容
计算:(能简算要简算):
+
-
-
+
10-
-
+(
-
)
6.39-
+3.61-
.
3 |
5 |
2 |
3 |
5 |
6 |
7 |
8 |
5 |
12 |
1 |
6 |
10-
1 |
4 |
3 |
4 |
5 |
8 |
2 |
3 |
5 |
8 |
6.39-
4 |
7 |
3 |
7 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:①②通分计算;
③利用减法的性质计算;
④利用加法交换律计算;
⑤利用加法交换律及减法的性质计算.
③利用减法的性质计算;
④利用加法交换律计算;
⑤利用加法交换律及减法的性质计算.
解答:
解:①
+
-
=
+
-
=
②
-
+
=
-
+
=
③10-
-
=10-(
+
)
=10-1
=9
④
+(
-
)
=
-
+
=
⑤6.39-
+3.61-
=6.39+3.61-(
+
)
=10-1
=9
3 |
5 |
2 |
3 |
5 |
6 |
=
18 |
30 |
20 |
30 |
25 |
30 |
=
13 |
30 |
②
7 |
8 |
5 |
12 |
1 |
6 |
=
21 |
24 |
10 |
24 |
4 |
24 |
=
5 |
8 |
③10-
1 |
4 |
3 |
4 |
=10-(
1 |
4 |
3 |
4 |
=10-1
=9
④
5 |
8 |
2 |
3 |
5 |
8 |
=
5 |
8 |
5 |
8 |
2 |
3 |
=
2 |
3 |
⑤6.39-
4 |
7 |
3 |
7 |
=6.39+3.61-(
4 |
7 |
3 |
7 |
=10-1
=9
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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