2/3-1/25= 观察1/6=1/2-1/3 ,1/12=1/3-1/4,1/20=1/4-1/5...你能很快计算1

2/3-1/25= 观察1/6=1/2-1/3 ,1/12=1/3-1/4,1/20=1/4-1/5...你能很快计算1/6+1/12+1/20+1/30+1/42吗?
what's the weather like in Beijing in autumn?怎么答?
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