计算:(1)(2x²-3x+1)(2x²+3x-1) (2)(a-2b+3c)²
问题描述:
计算:(1)(2x²-3x+1)(2x²+3x-1) (2)(a-2b+3c)²
答
⑴原式=(2X^2)^-(3X-1)^2
=4X^4-9X^2+6-1
⑵原式=a^2+4b^2+9c^2-4ab+6ac-12bc.