整式乘除(2x+1)²-(x+3)²-(x-1)²+1给个详细的计算过程,
问题描述:
整式乘除(2x+1)²-(x+3)²-(x-1)²+1给个详细的计算过程,
答
(2x+1)²-(x+3)²-(x-1)²+1
=4x^2+4x+1-(x^2+9+6x)-(x^2+1-2x)+1
=4x^2+4x+1-x^2-9-6x-x^2-1+2x+1
=2x^2-8(2x+1)²-(x+3)²-(x-1)²+1=(4x+1)-(2x+9)-(2x-1)+1=4x(2x+9)+4x(2x-1)+1(2x+9)+1(2x-1)+1=8x+36x+8x-4x+2x+9+2x+1=52x+10帮我看看我哪里错了,看不明白你的。(2x+1)² =4x²+4x+1(x+3)² =x² +9+6x(x-1)² =x² +1-2x(2x+1)²-(x+3)²-(x-1)²+1=4x²+4x+1-(x² +9+6x)-(x² +1-2x)+1=4x²+4x+1-x² -9-6x-x² -1+2x+1=2x²-8(2x+1)² =4x²+4x+1 的4x哪里来的?(x+3)² =x² +9+6x的6x哪里来的?(x-1)² =x² +1-2x的2x哪里来的?平方法则(a+b)²=a²+b²+2ab(a-b)²=a²+b²-2ab