题目内容
用简便方法计算
51×19
答案:
解析:
解析:
51×19 =20×51-51或=50×19+19 =1020-51 =950+19 =969 =969 |
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题目内容
用简便方法计算
51×19
51×19 =20×51-51或=50×19+19 =1020-51 =950+19 =969 =969 |