解法一(基础解法)X - (1/2X+3) - 1/2 [X - (1/2X + 3 )] - 3 = 48 X - 1/2X - 3 - 1/2 (X - 1/2X - 3) - 3 = 48 1/2X - 3 - 1/2 (1/2X - 3 ) - 3 = 48 1/2X - 3 - 1/4 X + 3/2 - 3 = 48 1/4X + 3/2 - ...
X-(1/2X+3)-1/2[X-(1/2X+3)]-3=48
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