(5m-1)/(2m-3)+(7-m)/2=5等式两边同时乘以2(2m-3)得:2(5m-1)+(7-m)(2m-3)=10(2m-3)10m-2+14m-21-2m^2+3m=20m-302m^2-7m-7=02(m^2-7/2 m)=72(m-7/4)^2=7+49/82(m-7/4)^2=105/8(m-7/4)^2=105/16m-7/4=+/-√105/4m=7/4+/-√105/4m1=(7+√105)/4, m2=(7-√105)/4