4(3a-b)²-36a+12b+9因式分解
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4(3a-b)²-36a+12b+9因式分解
4(3a-b)²-36a+12b+9因式分解
4(3a-b)²-36a+12b+9因式分解
4(3a-b)²-36a+12b+9
=4(3a-b)²-12(3a-b)+9
=[2(3a-b)]²-2X2(3a-b)X3+3²
=[2(3a-b)-3]²
=(6a-2b-3)²