1,8,9,4,( C ),1/6A 3 B 2 C 1 D 1/32.133/57,119/51,91/39,49/2

wiaf2022-10-04 11:39:541条回答

1,8,9,4,( C ),1/6A 3 B 2 C 1 D 1/32.133/57,119/51,91/39,49/21,( A ),7/3A 28/12 B 21/14 C 28/9 D 31/15 3.1/(12*13)+1/(13*14)+.+1/(19*20)=?A 1/20 B 1/30 C 1/40 D 1/50

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脱乳酶 共回答了22个问题 | 采纳率100%
分析如下:1.1^4=1 2^3=8 3^2=9 4^1=4 5^0=1 6^-1=1/6所以答案为C2.各个分式都约分最后都是为7/3,所以答案为A3.原式=(1/12-1/13)+(1/13-1/14)+.+(1/19-1/20 = 1/12-1/20 =(5-3)/60 =1/30 即答案为A"
1年前

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