(2a+3b-1)²

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/07 02:13:54

(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