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两数之和与两数之商都为6,那么这两数之积减这两数之差(大减小)等于()A.2647B.517C.67D.649

题目详情

4
7

B. 5
1
7

C.
6
7

D.
6
49
4
7
4477
1
7

C.
6
7

D.
6
49
1
7
1177
6
7

D.
6
49
6
7
6677
6
49
6
49
664949
▼优质解答
答案和解析
可设较大的数为甲,较小的数为乙.
由差倍公式可得乙是:6÷(6+1)=
6
7

那么甲是:
6
7
×6=
36
7

两个数的积是:
6
7
×
36
7
=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
6
7
666777,
那么甲是:
6
7
×6=
36
7

两个数的积是:
6
7
×
36
7
=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
6
7
666777×6=
36
7

两个数的积是:
6
7
×
36
7
=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
36
7
363636777;
两个数的积是:
6
7
×
36
7
=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
6
7
666777×
36
7
=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
36
7
363636777=
216
49

两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
216
49
216216216494949,
两数之差为:
36
7
-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
36
7
363636777-
6
7
=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
6
7
666777=
30
7
=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
30
7
303030777=
210
49

则:
216
49
-
210
49
=
6
49

故选:D.
210
49
210210210494949,
则:
216
49
-
210
49
=
6
49

故选:D.
216
49
216216216494949-
210
49
=
6
49

故选:D.
210
49
210210210494949=
6
49

故选:D.
6
49
666494949;
故选:D.