∵27²=a^6
(3³)²=a^6
3^6=a^6
∴a=3
∵27²=9^b
(3³)²=9^b
(3²)³=9^b
9³=9^b
∴b=3
(2a+b)²+(a-2b)²-2(a-2b)(2a+b)
=[(2a+b)-(a-2b)]²
=(a+3b)²
=(3+9)²
=12²
=144
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有新问题请求助,