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3/4+27/28+69/70+129/130+207/208+303/304+417/418+549/550等于多少

题目详情
3/4+27/28+69/70+129/130+207/208+303/304+417/418+549/550
等于多少
▼优质解答
答案和解析
3/4+27/28+69/70+129/130+207/208+303/304+417/418+549/550
=(1-1/4)+(1-1/28)+(1-1/70)+(1-1/130)+(1-/208)+(1-1/304)+(1-1/418)+(1-1/550)
=(1+1+1+1+1+1+1+1)-(1/4+1/28+1/70+1/130+1/208+1/304+1/418+1/550)
=8-[(1-1/4)/3+(1/4-1/7)/3+(1/7-1/10)/3+(1/10-1/13)/3+(1/13-1/16)/3+(1/16-1/19)/3+(1/19-1/22)/3+(1/22-1/25)/3]
=8-(1-1/4+1/4-1/7+1/7-1/10-1/10+1/13-1/13+1/13-1/16+1/16-1/19+1/19-1/22+1/22-1/25)/3
=8-(1-1/25)/3
=8-(24/25)/3
=8-8/25
=192/25
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