1,(x+18)÷(x÷13.5)＝x÷＜(x+18)÷24＞
(X+18)((X+18)/24=X*X/13.5
13.5(x+18)^2-x^2*24=0
9(x+18)^2-16x^2=0
(3x+54+4x)(3x+54-4x)=0
(7x+54)(-x+54)=0
x1=54,x2=-54/7
2,
12÷x×12－1＝12÷(x＋2) ×12
144/x-1=144/(x+2)
(144-x)(x+2)=144x
-x^2+142x+288=144x
x^2+2x-288=0
(x-16)(x+18)=0(根据十字相乘法）
所以,x=16或x=-18