20163d083期珠算口诀：二下三去九进八开289中289
20163d084期珠算口诀：一下三去六进七开282
20163d085期珠算口诀：一下三去六进七开967
20163d086期珠算口诀：四下五去八进七开249
20163d087期珠算口诀：二下五去一进九
发布时间：
20163d083期珠算口诀：二下三去九进八开289中289
20163d084期珠算口诀：一下三去六进七开282
20163d085期珠算口诀：一下三去六进七开967
20163d086期珠算口诀：四下五去八进七开249
20163d087期珠算口诀：二下五去一进九
发布时间：