已知A/x+3 -B/2x-1=3x-5/(x+3(2x-1))求A,B,的值
问题描述:
已知A/x+3 -B/2x-1=3x-5/(x+3(2x-1))求A,B,的值
答
(x+3)分之A-(2x-1)分之B =(x+3)(2x-1)分之3x-5(x+3)(2x-1)分之[A(2x-1)-B(x+3)]=(x+3)(2x-1)分之3x-5(x+3)(2x-1)分之[(2A-B)x-(A+3B)]=(x+3)(2x-1)分之3x-5则2A-B=3,A+3B=5解得A=2,...