题目内容

脱式计算,能简算的要简算.
2
3
÷8+
1
8
×
1
3
1
2
-
5
12
-
1
12
3
7
×(
4
5
-
2
3
)÷
2
15
19
30
×31-
19
30
(1)
2
3
÷8+
1
8
×
1
3

=
2
3
×
1
8
+
1
8
×
1
3

=
1
8
×(
2
3
+
1
3
),
=
1
8
×1,
=
1
8


(2)
1
2
-
5
12
-
1
12

=
1
2
-(
5
12
+
1
12
),
=
1
2
-
1
2

=0;

(3)
3
7
×(
4
5
-
2
3
)÷
2
15

=
3
7
×
2
15
×
15
2

=
3
7


(4)
19
30
×31-
19
30

=
19
30
×(31-1),
=
19
30
×30,
=19.
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