一根粉笔有两个头,3跟半粉笔有几个头?1k7@9`4Y2l,u3h3r7{9M1M
算式:提示.Z8v:{:}5D5Z)|)D3S3\1k7@9`4Y2l,u3h3r7{9M1M
答:3跟半粉笔有'r:T,?个头。1k7@9`4Y2l,u3h3r7{9M1M