题目内容

(1)25×
16
7
×
7
8
=______×(______×______)
(2)
5
8
×
2
3
×
8
15
=(______×______)×______
(3)
2
29
×(15×
29
31
)=______×(______×______)
(4)25
3
4
×4=______×______+______×______
(5)7×
7
8
=______×__________________×______
(6)1
4
5
×25=______×__________________×______
(7)54×(
8
9
-
5
6
)=______×__________________×______.
(1)25×
16
7
×
7
8
=25×(
16
7
×
7
8
);

(2)
5
8
×
2
3
×
8
15
=(
5
8
×
8
15
)×
2
3


(3)
2
29
×(15×
29
31
)=15×(
29
31
×
2
29
);

(4)25
3
4
×4,
=(25+
3
4
)×4,
=25×4+
3
5
×4;

(5)7×
7
8

=(8-1)×
7
8

=8×
7
8
-1×
7
8


(6)1
4
5
×25,
=(1+
4
5
)×25,
=1×25+
4
5
×25;

(7)54×(
8
9
-
5
6
)=54×
8
9
-54×
5
6

故答案为:(1)25,
16
7
7
8
;(2)
5
8
8
15
2
3
;(3)15,
29
31
2
29
;(4)25,4,
3
5
,4;(5)8,
7
8
,-,1,
7
8

(6)1,25,+,
4
5
,25;(7)54,
8
9
,-,54,
5
6
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