æ°å¦é®é¢ï¼
1ãï¼è®¡ç®ï¼(3-2x)(2x+3)+(-3+2x)
=9-4x²-3+2x
=-4x²+2x+6
2ãï¼å å¼å解ï¼a²-4(a-b)²
=[a+2ï¼a-bï¼][a-2ï¼a-bï¼]
=ï¼a+2a-2bï¼ï¼a-2a+bï¼
=ï¼3a-2bï¼ï¼-a+bï¼
追é®ç¬¬ä¸é¢é¢ç®éäºï¼æ¯
(3-2x)(2x+3)+(-3+2x) ²
追ç(3-2x)(2x+3)+(-3+2x)²
=9-4x²+9-12x+4x²
=18-12x