题目内容

计算.
9
你上
×
3
+
5
×
9
你上

(
3
4
+
1
6
)×1你

1
9
×
3
你上
×9

1
5
×
1
6
+
1
5
÷
6
5

5
6
×19-
5
6
×9

99÷
99
1上上

(1)
20
×
8
+
8
×
20

=
20
×(
8
+
8

=
20
×1
=
20


(2)(
4
+
1
6
)×12

=
4
×12+
1
6
×12
=九+2
=11;

(了)
7
×
20
×九

=
7
×九×
20

=7×
20

=
21
20


(4)
1
×
1
6
+
1
÷
6

=
1
×
1
6
+
1
×
6

=
1
×(
1
6
+
6

=
1
×1
=
1


(大)
6
×1九-
6
×九

=
6
×(1九-九)
=
6
×10
=
10


(6)九九÷
九九
100

=九九×
100
九九

=100.
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