由272=a6,
得36=a6,
∴a=±3;
由272=9b,
得36=32b,
∴2b=6,
解得b=3;
(1)当a=3,b=3时,
2a2+2ab=2×32+2×3×3=36.
(2)当a=-3,b=3时,
2a2+2ab=2×(-3)2+2×(-3)×3=18-18=0.
所以2a2+2ab的值为36或0.
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