1.计算:(3x+y+2)(3x-y-2).2.已知(3x+y+2)(3x-y-2).求（a+b-c）²。3.设x>0,且(3x+y+2)(3x-y-2).求(3x+y+2)(3x-y-2).的值。4.已知实数x满足(3x+y+2)(3x-y-2).求(3x+y+2)(3x-y-2).的值。

1.计算:2.已知求（a+b-c）²。3.设x>0,且求的值。4.已知实数x满足求的值。

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