已知36+(40+△)/[1-(1-1/3)x60%]=216,求三角形的值

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已知36+(40+△)/[1-(1-1/3)x60%]=216,求三角形的值

36+(40+△)/[1-(1-1/3)x60%]=216
(40+△)/[1-(2/3)x60%]=216-36
(40+△)/[1-40%]=180
(40+△)/60%=180
40+△=60%x180
△=108-40=68