For all numbers x and y, the operation фis defined by x ф y = (x+y)*(x-y) + (y...【小站备考】

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For all numbers x and y, the operation фis defined by x ф y = (x+y)*(x-y) + (y-x)*(y+x) +x*y. What is the value of (sqrt12)ф(sqrt3)?

A.6

B.12

C.18

D.24

E.36

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