=IF(MOD(INT(RAND()*10),2),MAX(ROUND(RAND()*10,0)+10,ROUND(RAND()*10,0))&”-“&MIN(ROUND(RAND()*10,0)+10,ROUND(RAND()*10,0)),ROUND(RAND()*10,0)&”+”&ROUND(RAND()*10,0))

自动生成２０内的加减，给小朋友算术用的

下载：20内加减

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