同学们去年和今年一共载了70棵树，今年栽了46棵，去年栽了多少棵？/M;V.?
算式：提示:c*O.N;k/L4I4o)w'U2|4{5W0}/M;V.?
答：去年栽了2|;z/R+o/R-o,^.y9V棵。/M;V.?