若a-b=3,则2a^2-2b^2-12b=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/07 15:00:39
![若a-b=3,则2a^2-2b^2-12b=](/uploads/image/z/7840401-33-1.jpg?t=%E8%8B%A5a-b%3D3%2C%E5%88%992a%5E2-2b%5E2-12b%3D)
x){ѽ4Q7XiL8#]$ ahdkTOZΆ~!FvP&!Dm$d aZ$Ac$&i<ٽ
<_dWR >OS
若a-b=3,则2a^2-2b^2-12b=
若a-b=3,则2a^2-2b^2-12b=
若a-b=3,则2a^2-2b^2-12b=
2a^2-2b^2-12b
=2(a+b)(a-b)-12b
=2(a+b)×3-12b
=6a+6b-12b
=6a-6b
=6(a-b)
=18
a=b+3,代数,等于18