原式=(2520+840+420+252+180+120+56)/5040=9388/5040
计算:1/2+1/6+1/12+1/20+/+1/30+1/42+1/56+1/72+1/90
2个回答
相关问题
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计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
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计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
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计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
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不通分计算1/2+1/6+1/12+1/20+1/30+1+42+1/56+1/72+1/90
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2\1-6\1-12\1-20\1-30\1-42\1-56\1-72\1-90\1
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
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2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?