6230-1-2-3-4-5-.-75-76-77-78-79这题怎么做=6230-(1+79)*39-40=6230-80*39-40=6230-3120-40=3070 39是怎么得来的;=6230-(1+2+3……+77+78+79)=6230-(79乘80除以2)=6230-(6230除以2)=6230除以2=3115 为什么要79乘80除以2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/10 14:54:28
![6230-1-2-3-4-5-.-75-76-77-78-79这题怎么做=6230-(1+79)*39-40=6230-80*39-40=6230-3120-40=3070 39是怎么得来的;=6230-(1+2+3……+77+78+79)=6230-(79乘80除以2)=6230-(6230除以2)=6230除以2=3115 为什么要79乘80除以2](/uploads/image/z/8685-45-5.jpg?t=6230-1-2-3-4-5-.-75-76-77-78-79%E8%BF%99%E9%A2%98%E6%80%8E%E4%B9%88%E5%81%9A%3D6230-%281%2B79%29%2A39-40%3D6230-80%2A39-40%3D6230-3120-40%3D3070+39%E6%98%AF%E6%80%8E%E4%B9%88%E5%BE%97%E6%9D%A5%E7%9A%84%EF%BC%9B%3D6230-%EF%BC%881%2B2%2B3%E2%80%A6%E2%80%A6%2B77%2B78%2B79%EF%BC%89%3D6230-%EF%BC%8879%E4%B9%9880%E9%99%A4%E4%BB%A52%EF%BC%89%3D6230-%EF%BC%886230%E9%99%A4%E4%BB%A52%EF%BC%89%3D6230%E9%99%A4%E4%BB%A52%3D3115+%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%8179%E4%B9%9880%E9%99%A4%E4%BB%A52)
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