题目内容

(1)18×
2
3
+6÷
2
3
(2)87×
3
86
(3)
5
9
×
4
7
+
3
7
÷
9
5
(4)(
4
9
+
5
6
-
1
3
)×18
(5)36×
3
4
-3÷
1
4
(6)
19
12
×
3
14
-
3
14
(1)18×
2
3
+6÷
2
3

=12+9
=21;

(2)87×
3
86

=(86+1)×
3
86

=86×
3
86
+1×
3
86

=3+
3
86

=3
3
86


(3)
5
9
×
4
7
+
3
7
÷
9
5

=
5
9
×
4
7
+
3
7
×
5
9

=
5
9
×(
4
7
+
3
7

=
5
9


(4)(
4
9
+
5
6
-
1
3
)×18
=
4
9
×18+
5
6
×18-
1
3
×18
=8+15-6
=23-6
=17;

(5)36×
3
4
-3÷
1
4

=27-12
=15;

(6)
19
12
×
3
14
-
3
14

=(
19
12
-1)×
3
14

=
7
12
×
3
14

=
1
8
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