问题 填空题
(1)
2
7
×
3
8
×7
=
2
7
×7×
3
8

=2×
3
8

=
3
4
______
(2)
7
10
×9+
7
10

=
7
10
×(9+1)
=
7
10
×10
=7______.
答案

(1)

2
7
×
3
8
×7,

=

2
7
×7×
3
8

=2×

3
8

=

3
4

(2)

7
10
×9+
7
10

=

7
10
×(9+1),

=

7
10
×10,

=7.

故答案为:√,√.

单项选择题
单项选择题