3d294期珠算口诀：四下九去六进七开628

3d295期珠算口诀：四下三去六进七开232

3d296期珠算口诀：四下三去六进七开361

3d297期珠算口诀：二下三去八进七开888

3d298期珠算口诀：二下五去八进九