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两边的方程同时乘x²-y²
得到105(x-y)+60(x+y)=12(x²-y²)
60(x-y)+152(x+y)=15(x²-y²)
420(x-y)+240(x+y)=48(x²-y²)
420(x-y)+1062(x+y)=105(x²-y²)
822(x+y)=105(x²-y²)
822=105(x-y)
822=105x-105y
3990(x-y)+2280(x+y)=456(x²-y²)
900(x-y)+2280(x+y)=225(x²-y²)
3090(x-y)=231(x²-y²)
3090=231(x+y)
3090=231x+231y
9042=1155x-1155y
15450=1155x+1155y
24492=2310x
x=24492/2310
6408=2310y
y=6408/2310
得到105(x-y)+60(x+y)=12(x²-y²)
60(x-y)+152(x+y)=15(x²-y²)
420(x-y)+240(x+y)=48(x²-y²)
420(x-y)+1062(x+y)=105(x²-y²)
822(x+y)=105(x²-y²)
822=105(x-y)
822=105x-105y
3990(x-y)+2280(x+y)=456(x²-y²)
900(x-y)+2280(x+y)=225(x²-y²)
3090(x-y)=231(x²-y²)
3090=231(x+y)
3090=231x+231y
9042=1155x-1155y
15450=1155x+1155y
24492=2310x
x=24492/2310
6408=2310y
y=6408/2310
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