(a+2b+3c)(a-2b-3c)=(___)^2-(____)^2
问题描述:
(a+2b+3c)(a-2b-3c)=(___)^2-(____)^2
答
(a+2b+3c)(a-2b-3c)=a^2-(2b+3c)^2
(a+2b+3c)(a-2b-3c)=(___)^2-(____)^2
(a+2b+3c)(a-2b-3c)=a^2-(2b+3c)^2