(a+2b+1)(-a+2b-1)+(a-1) 化简
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 18:58:08
![(a+2b+1)(-a+2b-1)+(a-1) 化简](/uploads/image/z/983597-5-7.jpg?t=%EF%BC%88a%2B2b%2B1%29%28-a%2B2b-1%29%2B%28a-1%29+%E5%8C%96%E7%AE%80)
(a+2b+1)(-a+2b-1)+(a-1) 化简
(a+2b+1)(-a+2b-1)+(a-1) 化简
(a+2b+1)(-a+2b-1)+(a-1) 化简
=[2b+(a+1)][2b-(a+1)]+(a-1)
=4b^2-(a+1)^2+(a-1)
=4b^2-a^2-2a-1+a-1
=4b^2-a^2-a-2
a+2b+1=4b
(a+2b+1)(-a+2b-1)+(a-1)²
=4b²-(a+1)²+(a-1)²
=4b²+[a-1+a+1][a-1-(a+1)]
=4b²-4a
利用平方差公式