9a^2b^2-3ab+1
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9a^2b^2-3ab+19a^2b^2-3ab+19a^2b^2-3ab+19a^2b^2-3ab+1(3ab)^2-3ab+1(3ab)^2-3ab+1/4+3/4令3ab=t∴(3ab)^2-3
9a^2b^2-3ab+1
9a^2b^2-3ab+1
9a^2b^2-3ab+1
9a^2b^2-3ab+1
(3ab)^2-3ab+1
(3ab)^2-3ab+1/4+3/4
令 3ab=t
∴(3ab)^2-3ab+1/4+3/4
=(t^2-t+1/4)+3/4
=(t-1/2)^2+3/4
=(3ab-1/2)^2+3/4
ab^3+b^2+b-a+1
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