(90-x)除以(90-x+100)=50%

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(90-x)除以(90-x+100)=50%
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(90-x)除以(90-x+100)=50%
(90-x)除以(90-x+100)=50%

(90-x)除以(90-x+100)=50%
(90-x)除以(90-x+100)=50%
90-x:90-x+100=50:100
100(90-x)=50(90-x+100)
x=-10
(根据比列的性质来解)(内项的积=外项的积)

-10

-10

(90-x)除以(190-x)=1/2
两边同时乘以(190-x) (90-x)=95-0.5x
-5=0.5x
x=-10