问题:
计算:(x+5) 2-(x-5) 2=( ); (m+t)(m-t)-(3m+2t)(3m-2t)=( )
计算:(x+5) 2-(x-5) 2=( ); (m+t)(m-t)-(3m+2t)(3m-2t)=( )
参考答案: