试题:
计算下列各题.(能简算的要简算)
2
15
×21×
5
14
4
7
×
6
13
+
3
7
×
6
13
5
6
+
3
4
)×24
lOO×
98
99
3
4
-
1
5
)×4×5
7
10
×l01-
7
10

答案:

我来补答
(1)
2
15
×21×
5
14
=1;

(2)
4
7
×
6
13
+
3
7
×
6
13

=(
4
7
+
3
7
)×
6
13

=1×
6
13

=
6
13


(3)(
5
6
+
3
4
)×24,
=
5
6
×24+
3
4
×24,
=20+18,
=38;

(4)lOO×
98
99

=(99+1)×
98
99

=99×
98
99
+1×
98
99

=98+
98
99

=98
98
99


(5)(
3
4
-
1
5
)×4×5,
=
3
4
×4×5-
1
5
×4×5,
=15-4,
=11;

(6)
7
10
×l01-
7
10

=
7
10
×(l01-1),
=
7
10
×100,
=70.
 
 
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这些题目你会做吗?