用因式分解法解下列方程1.3(x-5)^2=25-x^2.
问题描述:
用因式分解法解下列方程1.3(x-5)^2=25-x^2.
答
1.3(x-5)^2=(5+x)(5-x)
1.3(x-5)^2-(5+x)(5-x)=0
(x-5)(1.3(x-5)+1)=0
x-5=0或1.3(x-5)+1=0
x=5x=55/13你确定答案是对的?是对的啊~~~~