72+69+71+67+75+70+72+71怎样算简便
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72+69+71+67+75+70+72+71
=71+71+71+71+71+71+71+71+1-2+4-4+1-1
=71×8-1
=568-1
=567
咨询记录 · 回答于2022-05-11
72+69+71+67+75+70+72+71怎样算简便
72+69+71+67+75+70+72+71=71+71+71+71+71+71+71+71+1-2+4-4+1-1=71×8-1=568-1=567
懂了,谢谢
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