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S=12+(13+23)+(14+24+34)+…+(199+299+…+9799+9899)+)S=12+(23+13)+(34+24+14)+…+(9899+9799+…+299+199)2S=1+(1+1)+(1+1+1)+…+(1+1+…+1+1) =1+2+3+……+98 =12×98×(98+1)=4851. ∴S=48512.本期问题:四千多年以前,古埃及人就有了比较发达的数学,他们把当时所遇
S=12+(13+23)+(14+24+34)+...+(199+299+...+9799+9899)+)S=12+(23+13)+(34+24+14) +...+(9899+9799+...+299+199)2S=1+(1+1)+(1+1+1)+...+(1+1+...+1+1) =1+2+ 3+...+98 =12×98×(98+1)=4851. ∴S=48512. This issue: Four thousand years ago, the ancient Egyptians had more advanced mathematics.