(A+2B)^2=? A-2B=7,AB=3

来源：学生作业帮助网编辑：六六作业网时间：2024/11/17 15:53:27

(A+2B)^2=?A-2B=7,AB=3(A+2B)^2=?A-2B=7,AB=3(A+2B)^2=?A-2B=7,AB=3A-2B=7,AB=3(A+2B)^2=A^2+4AB+4B^2=(A^2

(A+2B)^2=? A-2B=7,AB=3
(A+2B)^2=? A-2B=7,AB=3

(A+2B)^2=? A-2B=7,AB=3
A-2B=7,AB=3
(A+2B)^2=A^2+4AB+4B^2=(A^2-4AB+4B^2)+8AB=(A-2B)^2+8AB
=7^2+8*3=73