五年級暑假生活數(shù)學(xué) 60頁
信息發(fā)布者:Sarah789
6. 26-1=25(場)
答:一共要進(jìn)行25場比賽才能產(chǎn)生冠軍
7. (4+10)x11÷2=77(根)
答:這堆圓木共有77根
1/1x2+1/2x3+1/3x4+...+1/9x10
=1-1/2+1/2-1/3+1/3-1/4+...+1/9-1/10
=1-1/10
=9/10
1/1x2-1/2x3-1/3x4-...-1/9x8
=1-1/2-1/2+1/3-1/3+1/4-...-1/8+1/9
=1-1+1/9
=1/9
2/1x3+2/3x5+2/5x7+...+2/97x99
=1-(1/3)+(1/3)-(1/5)+(1/5)-(1/7)+……+(1/97)-(1/99)
=1-(1/99)
=98/99
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