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口算
1
4
+
1
3
=
1
3
-
1
5
=
1
9
=
2
27
×9=
12
17
÷12=
2
9
×
3
4
=
3
4
÷
1
6
=
3
8
=
7.8×9+7.8=
5
6
+
4
11
×0=
24×(
3
8
+
5
6
)=
12×
2
25
-
24
25
=
分析:根据分数和小数的加减乘除的计算方法进行计算即可;7.8×9+7.8和24×(
3
8
+
5
6
)可以根据乘法分配律进行简算.
解答:解:
1
4
+
1
3
=
7
12
1
3
-
1
5
=
2
15
1
9
=9,
2
27
×9=
2
3
12
17
÷12=
1
17
2
9
×
3
4
=
1
6
3
4
÷
1
6
=
9
2
3
8
=0,
7.8×9+7.8=78,
5
6
+
4
11
×0=
5
6
24×(
3
8
+
5
6
)=29,
12×
2
25
-
24
25
=0.
点评:口算时,注意给出的数据和计算的符号,能简算的要简算.
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