若分式X-1分之3X+5无意义则x=1当3M-2X分之5-2M-X=0时5/(3M-2)-2M-1=05-(2M+1)(3M-2)=06M^2-M-2-5=06M^2-M-7=0(6M-7)(M+1)=0M=7/6或-1