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7/4:x=2/5:5/8

7/4:x=2/5:5/8 解: 2/5x=7/4×5/8 2/5x=35/32 x=175/64

7/4:x=2/5:5/8 x=7/4x5/8÷2/5 x=7/16

1/3,4,2/5,5/2,4/9,7/4,8/17,() 解:楼主最好给出选项否则有很多算法的 分为两个数列。 积数列:1/3,2/5,4/9,8/17,16/33 偶数列:4/1,5/2,7/4,(Y/X)11/8 积数列的分母3,5,9,17 5-3=2 9-5=4 17-9=8 积数列的分子:1,2,4,8 偶数列...

4/5:9/10=40:45=8:9 1/8:7/2=2:56=1:28 2/7:4/9=18:28=9:14 1/4:2/5=5:8

(x-4)/(x-5) + (x-8)/(x-9) = (x-5)/(x-6) + (x-7)/(x-8) (x-5+1)/(x-5) + (x-9+1)/(x-9) = (x-6+1)/(x-6) + (x-8+1)/(x-8) 1+1/(x-5) + 1+1/(x-9) = 1+1/(x-6) + 1+1/(x-8) 1/(x-5) + 1/(x-9) = 1/(x-6) + 1/(x-8) 1/(x-9) - 1/(x-8) = 1/(x-6)...

[56x(5/7-2/8)-0.625x0.5+5/8+1/2x62.5%]÷2又1/4 =(56×5/7-56×2/8-5/8×1/2+5/8+1/2×5/8)÷9/4 =[40-14-5/8]×4/9 =203/8×4/9 =203/18

第一题8 第二题真(或者1)

(1)4÷X=25, 4÷X×X=25X, 25X=4, 25X÷25=4÷25, X=10;(2)8(x-2)=2(x+7), 8X-16=2X+14, 6X-16=14, 6X=30, X=5;(3)320:18%=6.5X, 320X=0.18×6.5, 320X=1.17, X=7.8.

设原价分别为7x,4x 则 (7x+70):(4x+70)=8:5 (7x+70)*5=8*(4x+70) 35x+350=32x+560 3x=210 x=70 则A 490元 B280元

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