计算：[3(x+b)^2-6(x+b)^2+9(x+b)]/[3(x+b)]-(x-b)^2;_数学解答

计算：[3(x+b)^2-6(x+b)^2+9(x+b)]/[3(x+b)]-(x-b)^2;

人气：480 ℃　时间：2020-04-13 06:39:20

解答

原式=3(x+b)³/[3(x+b)]-6(x+b)²/[3(x+b)]+9(x+b)/[3(x+b)]-(x-b)²
=x²+2bx+b²-2x-2b+3-x²+2bx-b²
=4bx-2x-2b+3