(m2-25)x2-2m2x+m2=0(m不等于正负5)
问题描述：
(m2-25)x2-2m2x+m2=0(m不等于正负5)
答
(m+5)(m-5)x²-[(m²+5m)+(m²-5m)]x+m²=0(m+5)(m-5)x²-m(m+5)x-m(m-5)x+m²=0(m+5)x[(m-5)x-m]-m[[(m-5)x-m]=0[(m-5)x-m][(m+5)x-m]=0x=m/(m-5),x=m/(m+5)