因式分解
$(l+m)^{2}-(l-m)^{2}$
给定:$(l+m)^{2}-(l-m)^{2}$
待做:对表达式进行因式分解
解答:
$(l+m)^{2}-(l-m)^{2}$
= $l^{2}+m^{2}+2lm-l^{2}+m^{2}-2lm$
= $2l^{2}+2m{^2}$
= $2(l^{2}+m^{2})$
因此,对 $(l+m)^{2}-(l-m)^{2}$ 进行因式分解后,我们得到
$2(l^{2}+m^{2})$广告