734+(549-334)的简便算法是请选择AB/M'S-F9]1Z)v5}0l5W6Y(E(w4N;R4~1S-U*`1T0z
A.734+549-3344N;R4~1S-U*`1T0z
B.734-334+5494N;R4~1S-U*`1T0z