(2x-y-15)² 化简
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(2x-y-15)²化简(2x-y-15)²化简(2x-y-15)²化简(2x-y-15)²=[(2x-y)-15]²=(2x-y)²-30
(2x-y-15)² 化简
(2x-y-15)² 化简
(2x-y-15)² 化简
(2x-y-15)²
=[(2x-y)-15]²
=(2x-y)²-30(2x-y)+225
=4x²-4xy+y²-60x+30y+225