3个回答
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= 5.9916666666667
嘿嘿 、给个采纳吧、 :)
嘿嘿 、给个采纳吧、 :)
参考资料: 计算器
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6/5+11/12+19/20+29/30+41/42+55/56
=(1+1/5)+(1-1/12)+(1-1/20)+(1-1/30)+(1-1/42)+(1-1/56)
=(6+1/5)-(1/12+1/20+1/30+1/42+1/56)
=(6+1/5)-[1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)+1/(7×8)]
=(6+1/5)-[1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8]
=6+1/5-1/3+1/8
=720/120+24/120-40/120+15/120
=719/120
=(1+1/5)+(1-1/12)+(1-1/20)+(1-1/30)+(1-1/42)+(1-1/56)
=(6+1/5)-(1/12+1/20+1/30+1/42+1/56)
=(6+1/5)-[1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)+1/(7×8)]
=(6+1/5)-[1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8]
=6+1/5-1/3+1/8
=720/120+24/120-40/120+15/120
=719/120
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