(2a+3b-1)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 21:10:03
![(2a+3b-1)²](/uploads/image/z/7941969-9-9.jpg?t=%282a%EF%BC%8B3b%EF%BC%8D1%29%26%23178%3B)
(2a+3b-1)²
(2a+3b-1)²
(2a+3b-1)²
(2a+3b-1)²
=[(2a+3b)-1]²
=(2a+3b)²-2(2a+3b)+1
=4a²+12ab+9b²-4a-6b+1
4a²+12ab+9b²+1
(2a+3b-1)(2a+3b-1)
(2a)2+(3b-1)2+2(6ab-2a)
=4a2+(9b2-6b+1)+12ab-4a
=4a2+9b2-6b+1+12ab-4a