解:原式=9/11+5/8一(4/11一3/8)=9/11一4/11+5/8+3/8=5/11+1=16/11
9/11+5/8–(4/11–3/8)=9/11+5/8–4/11+3/8=(9/11–4/11)+(5/8+3/8)=5/11+1=16/11(或1又5/11)