一块蛋糕分成13块，爸爸吃了4块，妈妈吃了5块，莉莉吃了2块。爸爸和妈妈一共吃了多少块？这块蛋糕还剩几块没吃？+z'\1x3h+H;c(w
算式：提示/J9m:k5T3J+z'\1x3h+H;c(w
答：爸爸和妈妈一共吃了(u1H9c2i)K,i块。+z'\1x3h+H;c(w
算式：提示2C'K8Y(t1H9l7j/s6\+]1C'i+z'\1x3h+H;c(w
答：这块蛋糕还剩;|1x'a+^,s+z3R6V块没吃。+z'\1x3h+H;c(w