问题 解答题
神机妙算细又巧(能简算的要写出简算过程)
①0.65×14+87×65%-
13
20

(
2
3
-
1
2
+
1
6
1
24

76×(
1
23
-
1
53
)
+23×(
1
53
+
1
76
)-53×(
1
23
-
1
76
)
答案

①0.65×14+87×65%-

13
20

=0.65×14+87×0.65-0.65,

=0.65×(14+87-1),

=0.65×100,

=65;

(

2
3
-
1
2
+
1
6
1
24

=(

2
3
-
1
2
+
1
6
)×24,

=

2
3
×24-
1
2
×24+
1
6
×24,

=16-12+4,

=8;

76×(

1
23
-
1
53
)+23×(
1
53
+
1
76
)-53×(
1
23
-
1
76
)

=76×

1
23
-76×
1
53
+23×
1
53
+23×
1
76
-53×
1
23
+53×
1
76

=

76
23
-
76
53
+
23
53
+
23
76
-
53
23
+
53
76

=(

76
23
-
53
23
)+(
23
76
+
53
76
)-(
76
53
-
23
53
),

=1+1-1,

=1.

判断题
单项选择题