同学们做操,每行站18人,正好站20行。如果每行站12人,要站多少行?(用比例解).~9p.i7`:v/N:f2s9C1@;]2t*x
算式:提示0g8W7b5I.~9p.i7`:v/N:f2s9C1@;]2t*x
答:站5x.w1|7_/F1O)N行。.~9p.i7`:v/N:f2s9C1@;]2t*x