23x/2-1=1-(x+5)/6 on the shore is multiplied by 6 to get 9x-6=x+5, and the shift term 9x-x=5+6.
8x = 1 1x = 1 1/8。
Three17x-14 =1-2x+12
7x-2x= 13+ 14
5x=27
x=27/5
A (x-1) =1-a (x+1) simplification
ax-a= 1-ax+a
2ax=2a+ 1
Replace 2ax=2a+ 1 with x=27/5.
54a/5=2a+ 1
54a/5-2a= 1
54a- 10a=5
44a=5
a=5/44
2 (1) Let the actual payment amount be F.
When adopting the scheme of buy one get one free, F=250+5(x- 10).
When converting by 9, F=0.9(250+5x).
(2) When the charges are the same, 250+5(x- 10)=0.9(250+5x).
200+5x=225+4.5x
5x-4.5x=225-200
0.5x=25
x=50
So when x=50, the charges of the two preferential ways are the same.
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