题目内容

能简算的要简算.
1
3
÷
4
9
+
1
3
+
1
4
12
5
×(
5
6
+
3
4
)+
4
5
78×
3
79
2
15
÷(
3
4
+
2
15
1
3
÷
4
9
+
1
3
+
1
4

=
1
3
×
9
4
+
1
3
+
1
4

=
3
4
+
1
4
+
1
3

=1+
1
3

=1
1
3

12
5
×(
5
6
+
3
4
)+
4
5

=
12
5
×
5
6
+
12
5
×
3
4
+
4
5

=2+
9
5
+
4
5

=2+(
9
5
+
4
5

=2+
13
5

=2+2
3
5

=4
3
5

③78×
3
79

=(79-1)×
3
79

=79×
3
79
-1×
3
79

=3-
3
79

=2
76
79

2
15
÷(
3
4
+
2
15

=
2
15
÷(
45
60
+
8
60

=
2
15
÷
53
60

=
2
15
×
60
53

=
8
53
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