问题 解答题
怎样简便就怎样算.
36×(
1
2
+
1
3
+
1
4
5
7
×[0.75-(
1
2
+0.25)]
1.25+(
5
6
-
1
4
)×12
答案

(1)36×(

1
2
+
1
3
+
1
4
),

=36×

1
2
+36×
1
3
+36×
1
4

=18+12+9,

=39;

(2)

5
7
×[0.75-(
1
2
+0.25)],

=

5
7
×[0.75-
1
2
-0.25],

=

5
7
×[0.75-0.25-
1
2
],

=

5
7
×[0.5-0.5],

=

5
7
×0,

=0;

(3)1.25+(

5
6
-
1
4
)×12,

=1.25+(

5
6
×12-
1
4
×12),

=1.25+(10-3),

=1.25+7,

=8.25.

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