(多选题)下列解题过程正确的是(本题3.0分)A.lim _(xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x-1)(x+1))=lim _(xarrow 1)dfrac (x+2)(x+1)=dfrac (1+2)(1+1)=dfrac (3B.lim _{xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x-1)(x+1))=lim _(xarrow 1)dfrac (x+2)(x+1)=dfrac (1+2)(1+1)=dfrac (3C.lim _{xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x-1)(x+1))=lim _(xarrow 1)dfrac (x+2)(x+1)=dfrac (1+2)(1+1)=dfrac (3D.lim _{xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x-1)(x+1))=lim _(xarrow 1)dfrac (x+2)(x+1)=dfrac (1+2)(1+1)=dfrac (3E.lim _{xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x-1)(x+1))=lim _(xarrow 1)dfrac (x+2)(x+1)=dfrac (1+2)(1+1)=dfrac {3