题目内容

3
5
+
1
15
)×30
17×
3
16
100×
100
101
7
8
×
4
15
-
7
15
×
4
8
9
3
5
×
1
8
34-34×
26
27
(1)(
3
5
+
1
15
)×30,
=
3
5
×30+
1
15
×30,
=18+2,
=20;

(2)17×
3
16

=(16+1)×
3
16

=16×
3
16
+1×
3
16

=3+
3
16

=3
3
16


(3)100×
100
101

=(101-1)×
100
101

=101×
100
101
-1×
100
101

=100-
100
101

=99
1
101


(4)
7
8
×
4
15
-
7
15
×
4
8

=
7
8
×
4
15
-
7
8
×
4
15

=
7
8
×(
4
15
-
4
15
),
=0;

(5)9
3
5
×
1
8

=(8+
8
5
)×
1
8

=8×
1
8
+
8
5
×
1
8

=1+
1
5

=1
1
5


(6)34-34×
26
27

=34×(1-
26
27
),
=34×
1
27

=
34
27
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