题目内容

怎样简便怎样算.
19
20
÷6+
1
6
×
1
20
18.8-
2
3
-3.8-
1
3
(1-
3
4
×
4
5
8
15
24×(
5
8
+
5
6
58÷4+0.25×41+
1
4
1
12
÷(4-
7
15
-
8
15
19
20
÷6+
1
6
×
1
20

=(
19
20
+
1
20
)×
1
6

=1×
1
6

=
1
6
24×(
5
8
+
5
6
),
24×
5
8
+
24×
5
6

=15+20,
=35;
18.8-
2
3
-
3.8-
1
3

=18.8-3.8-(
2
3
+
1
3
),
=15-1,
=14;
58÷4+0.25×41+
1
4

=58×
1
4
+
1
4
×41+
1
4

=(58+41+1)×
1
4

=100×
1
4

=25;
(1-
3
4
×
4
5
÷
8
15

=(1-
3
5
÷
8
15

=
2
5
×
15
8

=
3
4

1
12
÷(4-
7
15
-
8
15
)

=
1
12
÷[4-(
7
15
+
8
15
)],
=
1
12
÷[4-1],
=
1
12
×
1
3

=
1
36
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