(-1/2a-1/3b)²要个详细过程

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(-1/2a-1/3b)²要个详细过程(-1/2a-1/3b)²要个详细过程(-1/2a-1/3b)²要个详细过程(-1/2a-1/3b)²=1/4a²

(-1/2a-1/3b)²要个详细过程
(-1/2a-1/3b)²
要个详细过程

(-1/2a-1/3b)²要个详细过程
(-1/2a-1/3b)²=1/4a²+1/3ab+1/9b²