X - Y = X/Y
变形可得
X = Y^2/(Y - 1)
另再给出 13 组解
7.2 - 1.2 = 7.2/1.2
7.2 - 6 = 7.2/6
121/10 - 11/10 = 121/10/(11/10)
121/10 - 11 = 121/10/11
16/3 - 4/3 = 16/3/(4/3)
16/3 - 4 = 16/3/4
64/7 - 8/7 = 64/7/(8/7)
64/7 - 8 = 64/7/8
-81/10 - 9/10 = -81/10/(9/10)
-81/10 - (-9) = -81/10/(-9)
-16/5 - 4/5 = -16/5 - (4/5)
-16/5 - (-4) = -16/5/(-4)
-1/2 - (-1) = -1/2/(-1)