简算:1/15+1/35+1/63+1/99
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简算:1/15+1/35+1/63+1/99
简算:1/15+1/35+1/63+1/99
简算:1/15+1/35+1/63+1/99
1/15+1/35+1/63+1/99
=(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)÷2
=(1/3-1/11)÷2
=4/33
=1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9-1/11)
=1/2(1/3-1/11)
=4/33
1/35=0.5*(1/5-1/7) 1/63=0.5*(1/7-1/9) 1/99=0.5*(1/9-1/11)相加得到 原式=0.5*(1/3-1/11)=4/33 简单:计算机