题目内容

1
6
×35+
5
6
×17．
分析：35=5×7，那么
1
6
×35=
5
6
×7，然后再根据乘法分配律进行简算．
解答：解：
1
6
×35+
5
6
×17
=
1
6
×（5×7）+
5
6
×17
=
5
6
×7+
5
6
×17
=
5
6
×（7+17）
=
5
6
×24
=20．
点评：此题主要考查了乘法分配律的灵活运用，注意根据实际情况把一个因数看作两个数的乘积来简算．
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计算下面各题
1
2
+
1
3
=
4
7
+
2
5
=
6
7
-
1
2
=
3
5
+
5
6
=
8
9
-
3
4
=
5
7
-
5
14
=
1-
2
5
=
4
5
-
1
3
=
1
6
+
3
8
=		  
8
9
-
5
6
=
直接写得数．
1
3
-
1
6
=
7
12
+
5
6
=		 1+
4
9
=
1
2
-
1
8
=
1-
3
5
=
1
4
+
1
5
=		 1-
4
15
=
6
7
+
4
5
+
1
7
=
6
1
2
-
1
4
=		 7-
4
9
-
5
9
=		 8-4
4
5
=
1
6
+
4
7
+
5
6
+
3
7
=
直接写出得数：
1
3
+
2
3
=
1
2
-
1
4
=		 1-
1
8
=
3
5
+
7
5
=
3
4
-0.25=
1
3
+
2
9
=		 3-
5
7
=
1
6
-
1
7
+
5
6
=		 1-
1
2
-0.5=		 12.5×8=
简便方法计算．
64
1
17
×
1
9
            
1
6
×35+
5
6
×17          		 3.5×1
1
4
+1.25×2
7
10
+3.8÷
4
5
1998÷1998
1998
1999
       		  
1
17
×
4
9
+
5
17
×
1
9
       		  
1
7
×
3
4
+
3
7
×
1
6
+
6
7
×
1
12
．
直接写得数．
5
7
-
3
7
=
1
3
-
1
5
=
5
12
+
1
6
=
3
5
+
1
10
=
1-
1
2
-
1
4
=
17
12
-
1
6
-
5
6
=
8
9
-
1
3
=
4
9
+
7
9
=

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