9(x-2y)² -1,要过程!
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9(x-2y)²-1,要过程!9(x-2y)²-1,要过程!9(x-2y)²-1,要过程!9(x-2y)²-1=[3(x-2y)]²-1²=
9(x-2y)² -1,要过程!
9(x-2y)² -1,要过程!
9(x-2y)² -1,要过程!
9(x-2y)² -1
=[3(x-2y)]²-1²
=(3x-6y)²-1²
=(3x-6y+1)(3x-6y-1)