小东家住在大厦11层,10层到11层有21级台阶,你能算出从底楼到小东家有多少级台阶吗?+s(r6r1z:w8W5j,F5X'P-A:w/^.Y
算式:提示9?)Q3W:T.B;|,\2C)C1Q;]*N9|/?)k+s(r6r1z:w8W5j,F5X'P-A:w/^.Y
答: 从底楼到小东家有4[*G/z6g0G6d)I*]2a2A6?级台阶。+s(r6r1z:w8W5j,F5X'P-A:w/^.Y