已知ab=cd=ef=57,且2b-d+5f≠0,则2a-c+5e2b-d+5f=______.-数学

题目简介

已知ab=cd=ef=57,且2b-d+5f≠0,则2a-c+5e2b-d+5f=______.-数学

题目详情

已知
a
b
=
c
d
=
e
f
=
5
7
,且2b-d+5f≠0,则
2a-c+5e
2b-d+5f
=______.
题型:填空题难度:中档来源:不详

答案

class="stub"a
b
=class="stub"c
d
=class="stub"e
f
=class="stub"5
7

∴a=class="stub"5
7
b
,c=class="stub"5
7
d
,e=class="stub"5
7
f

class="stub"2a-c+5e
2b-d+5f
=
2×class="stub"5
7
b-class="stub"5
7
d+5×class="stub"5
7
f
2b-d+5f
=class="stub"5
7
×1=class="stub"5
7

故答案是class="stub"5
7

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