(2\a²……)²=1\4a²+?+1 +3b)²=?+12a²b+?
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(2\a²……)²=1\4a²+?+1 +3b)²=?+12a²b+?
(2\a²……)²=1\4a²+?+1 +3b)²=?+12a²b+?
(2\a²……)²=1\4a²+?+1 +3b)²=?+12a²b+?
(2\a²……)²=1\4a²+?+1
题目错了
是(2\a+1)²=1\4a²+a/4+1
(2a²+3b)²=4a^4+12a²b+9b²