路易威登2016秋冬女包:规定运算&,使得X&Y=X*X-Y*Y/X*X+Y*Y,则求(-1/2)&(-1/3)

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一道数学题请给予解释．

规定运算&：使得 X&Y = X*X -(Y*Y)/(X*X) + Y*Y

(-1/2)&(-1/3)
= (-1/2)*(-1/2) - (-1/3)*(-1/3)/[(-1/2)*(-1/2)] + (-1/3)*(-1/3)
= 1/4 - 4/9 + 1/9
= 1/4 - 1/3
= -1/12

规定运算&：使得 X&Y = X*X -(Y*Y)/(X*X) + Y*Y

(-1/2)&(-1/3)
= (-1/2)*(-1/2) - (-1/3)*(-1/3)/[(-1/2)*(-1/2)] + (-1/3)*(-1/3)
= ¼ - 4/9 + 1/9
= ¼ - 1/3
= -1/12

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