(1/3+1/5+1/7+1/9)*(1/5+1/7+1/9+1/11)-(1/11*1/3*1/5+1/7+1/9)*(1/5+1/7+1/9)简便算法！
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(1/3+1/5+1/7+1/9)*(1/5+1/7+1/9+1/11)-(1/11*1/3*1/5+1/7+1/9)*(1/5+1/7+1/9)
=(1/3+1/5+1/7+1/9)*(1/5+1/7+1/9）+(1/5+1/7+1/9）*1/11+1/11*1/3-(1/11*1/3*1/5+1/7+1/9)*(1/5+1/7+1/9)
=(1/5+1/7+1/9){（1/3+1/5+1/7+1/9+1/11）-（1/11*1/3*1/5+1/7+1/9）}+1/11*1/3
继续化简
=(1/3+1/5+1/7+1/9)*(1/5+1/7+1/9）+(1/5+1/7+1/9）*1/11+1/11*1/3-(1/11*1/3*1/5+1/7+1/9)*(1/5+1/7+1/9)
=(1/5+1/7+1/9){（1/3+1/5+1/7+1/9+1/11）-（1/11*1/3*1/5+1/7+1/9）}+1/11*1/3
继续化简
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