问题 解答题
怎样简便就怎样算.
5
9
-0.375+
11
18
-
5
8
②12.5×0.32×25
9
20
÷6+
1
6
×
1
20
5
6
×0.25+
1
4
×
1
6
答案

5
9
-0.375+
11
18
-
5
8

=

5
9
-
3
8
+
11
18
-
5
8

=(

5
9
+
11
18
)-
3
8
-
5
8

=(

5
9
+
11
18
)-(
3
8
+
5
8
),

=

7
6
-1,

=

1
6

②12.5×0.32×25,

=12.5×0.8×0.4×25,

=(12.5×0.8)×(0.4×25),

=10×10,

=100;

9
20
÷6+
1
6
×
1
20

=

9
20
×
1
6
+
1
6
×
1
20

=(

9
20
+
1
20
)×
1
6

=

1
2
×
1
6

=

1
12

5
6
×0.25+
1
4
×
1
6

=

5
6
×
1
4
+
1
4
×
1
6

=(

5
6
+
1
6
)×
1
4

=1×

1
4

=

1
4

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