问题 解答题
用简便方法计算下面各题.
6
7
×
4
5
×14
1
4
-
1
5
)×60
(2-
1
65
)×13
1
8
×
1
3
)×3×8
1
2
+
1
7
)×2×7
1
6
×
4
7
+
3
2
×
1
6
57×
3
56
(
4
5
+
9
10
)×20
答案

(1)

6
7
×
4
5
×14,

=

6
7
×14×
4
5

=12×

4
5

=

48
5

(2)(

1
4
-
1
5
)×60,

=

1
4
×60-
1
5
×60,

=15-12,

=3;

(3)(2-

1
65
)×13,

=2×13-

1
65
×13,

=26-

1
5

=25

4
5

(4)(

1
8
×
1
3
)×3×8,

=(

1
8
×8)×(
1
3
×3),

=1×1,

=1;

(5)(

1
2
+
1
7
)×2×7,

=

1
2
×2×7+
1
7
×2×7,

=7+2,

=9;

(6)

1
6
×
4
7
+
3
2
×
1
6

=

1
6
×(
4
7
+
3
2
),

=

1
6
×
29
14

=

29
84

(7)57×

3
56

=(56+1)×

3
56

=56×

3
56
+1×
3
56

=3+

3
56

=3

3
56

(8)(

4
5
+
9
10
)×20,

=

4
5
×20+
9
10
×20,

=16+18,

=34.

选择题
单项选择题