A/X-5+B/X+2=5X-4/X^2-3X-10,求A^2-B^2的平方根
问题描述:
A/X-5+B/X+2=5X-4/X^2-3X-10,求A^2-B^2的平方根
答
A/(X-5)+B/(X+2)=(5X-4)/(X^2-3X-10)[A(X+2)+B(X-5)]/[(X-5)(X+2)]=(5X-4)/(X^2-3X-10)[(A+B)x+(2A-5B)]/(X^2-3X-10)=(5X-4)/(X^2-3X-10)比较等式两边,得A+B=5 (1)2A-5B=-4(2)解(1) (2)得 A=3 B=2所以 A...