一道数学题（难!）已知:(x+1)/(x+1)(x-1)=a/(x-1)+b/(x-2),求a与b的值.
2019-04-13
一道数学题（难!）
已知:(x+1)/(x+1)(x-1)=a/(x-1)+b/(x-2),求a与b的值.
优质解答
(x+1)/(x+1)(x-1)=a/(x-1)+b/(x-2)
1＝a+b(x-1)/(x-2)
x-2=a(x-2)+b(x-1)
a+b=1
2a+b=2
a=1
b=0
(x+1)/(x+1)(x-1)=a/(x-1)+b/(x-2)
1＝a+b(x-1)/(x-2)
x-2=a(x-2)+b(x-1)
a+b=1
2a+b=2
a=1
b=0