25%=d+2*[(10%-0.5d)/0.5-d] ,求D,
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25%=d+2*[(10%-0.5d)/0.5-d] ,求D,
25%=d+2*[(10%-0.5d)/0.5-d] ,求D,
25%=d+2*[(10%-0.5d)/0.5-d] ,求D,
0.25=d+2*[(0.1-0.5d)/0.5-d]
=d+2*[0.1/0.5-0.5d/0.5-d]
=d+2*(0.2-d-d)
=d+2*(0.2-2d)
=d+0.4-4d
即:0.25=0.4-3d
3d=0.4-0.25
3d=0.15
d=0.05