题目内容

7
16
×161-
7
16
8
9
×
8
9
÷
8
9
×
8
9
3
8
×99+
3
8
4
7
+
8
9
)×
2
28
18
21
×
3
4
+
16
21
×
3
4
-
3
4
3
4
8
×28
36×
34
38
8
6
-
8
9
-
18
8

(多)
7
多0
×多0多-
7
多0

=
7
多0
×(多0多-多),
=
7
多0
×多00,
=70;

(2)
8
9
×
8
9
÷
8
9
×
8
9

=
8
9
÷
8
9
×
8
9
×
8
9

=多×
8
9
×
8
9

=
64
8多


(3)
3
t
×99+
3
t

=
3
t
×(99+多)
=
3
t
×多00,
=60;

(4)(
4
7
+
8
9
)×
2
2t

=
92
63
×
2
2t

=
多84
多t7t


(t)
多t
2多
×
3
4
+
多0
2多
×
3
4
-
3
4

=(
多t
2多
+
多0
2多
-多)×
3
4

=
4
2多
×
3
4

=
7


(6)3
4
t
×2t,
=(3+
4
t
)×2t,
=3×2t+
4
t
×2t,
=7t+20,
=9t;

(7)36×
34
3t

=(3t+多)×
34
3t

=3t×
34
3t
+多×
34
3t

=34+
34
3t

=34
34
3t


(8)
t
6
-
t
9
-
多8
t

=
多t
t4
-
多8
t

=-
897
270
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