甲数和乙数的比是2：5，甲数比乙数少(y,l3I+}0I:J1r0^+s;Y(Z'[-P%，乙数比甲数多0p.b(f.t:A'W4y3v0B2O'x%。8z7z'F;c9f(w*F2y4X3x(@;};^2P)M