题目内容

8＋(    )=15
答案：7
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怎么简便怎么算
5
9
×16+
5
9
×20		 8÷[（
2
3
+
1
5
）×
1
13
]．
直接写出得数．
81-46=
0.56÷0.7=
8-3.2=
15÷1%=
11
4
×
2
11
=
1
4
+
1
5
=
0.42=
6
7
÷2=
3
4
+
1
4
=		 7.5-（2.5+3.8）=
2
3
+
1
5
=		 0.36+1.54= 135÷5= 2-
1
6
-
5
6
=
1
5
+
5
6
+
4
5
=
1
7
-
1
14
=		 1-
1
2
-
1
4
=		 （
17
20
+
3
10
）-（
17
20
-
7
10
）=
5
6
-
4
5
=
直接写得数
3
4
+
1
2
=
1
6
÷7=
13
14
×
2
13
=
1
4
÷
1
2
=
1
12
×8=		 9÷
3
4
=		 15×
4
5
=
1
3
-
1
4
=
4
5
÷
2
5
=
4
9
×
3
4
=
3
4
×
6
7
=
7
5
÷
5
7
=
4
4
÷
5
5
=8﹕
10
10
=
12
12
﹕15=
(  )
20
=
4
5
．

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