凌云之士2011-01-25TA获得超过9967个赞关注A/(X+2)+B/(X-2)=4x/(X^2-4),(Ax-2A+Bx+2B)/(x^2-4)=4x/(X^2-4),[(A+B)x+2B-2A]/(x^2-4)=4x/(X^2-4),所以(A+B)x+2B-2A=4x所以A+B=42B-2A=0解得A=2B=2