珠心算一级练习题(可用于口算练习)1-4直加直减 1位6笔

1-4直加直减(1位数6笔)NO.一二三四五六七八九十十一十二A111412421221232-32-1-2-13-113-3-2-11-13-12-23-3-421-2-2-2-121-1-1121