一道数学题
以知(A/X-2)+(B/X+1)=3/(X+1)(X-2),求A和B的值.
写出步骤.
参考答案:(A/X-2)+(B/X+1)=3/(X+1)(X-2),
[A(X+1)+B(X-2)]/(X+1)(X-2)=3/(X+1)(X-2),
(AX+BX+A-2B)/(X+1)(X-2)=3/(X+1)(X-2),
A+B=0,A-2B=3
A=1,B=-1
以知(A/X-2)+(B/X+1)=3/(X+1)(X-2),求A和B的值.
写出步骤.
参考答案:(A/X-2)+(B/X+1)=3/(X+1)(X-2),
[A(X+1)+B(X-2)]/(X+1)(X-2)=3/(X+1)(X-2),
(AX+BX+A-2B)/(X+1)(X-2)=3/(X+1)(X-2),
A+B=0,A-2B=3
A=1,B=-1