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求答案1 5/6 7/10 3/5 8/15 ()

1/2。通分30,分子分别为30 25 21 18 16。分别为前项-5 -4 -3 -2。所以答案分子为16-1=15,分母30,即1/2

解: 8/15和13/25、因为8/15=40/75, 13/25=39/75所以8/15>13/25 5/12和3/8、因为5/12=20/48, 3/8=18/48 所以5/12>3/8; 3/5和11/20 因为3/5=12/20, 所以3/5>11/20; 1/6和5/8 因为1/6=4/24,5/8=15/24 所以1/623/36; 7/10和5/12 因为7/10=42/60, 5/1...

1/13*39*8/21 =1/3×8/21 =8/63 7/8/9*3/5/35/72 =7/72×3/5×72/35 =3/25 (1/15+3/49)*15-45/49 =1+45/49-45/49 =1 (7/10+5/6+4/5) =7/10+8/10+5/6 =15/10+5/6 =3/2+5/6 =14/6 =7/3

你好! 3/4-3/5= 3/20 8/15-1/3=1/5 1/2+3/5-7/10=2/5 1/12+1/6= 1/4 3/8+1/4=5/8 1/3+1/4+1/6+1/12=5/6 希望我的回答对你有所帮助

x+4/9=3/5 X=3/5-4/9 X=7/45 9/10-x=3/5 X=9/10+3/5 X=15/10 x+7/18=5/9 X=5/9-7/18 X=1/6 7/16+x=5/24 X=5/24-7/16 X=-11/24 x-(4/7-1/3)=19/21 X-5/21=19/21 X=5/21+19/21 X=8/7 8/15+x=5/6 X=5/6-8/15 X=3/10

2/3一5/6×3/10+3/2 =2/3-1/4+3/2 =(8-3+18)/12 =23/12 7/4÷(2/3+1/2)x4/5 =(7/4*4/5)/(7/6) =7/5*6/7 =1.2 8/15÷9+1/9x7/15 =1/15*(8/9+7/9) =1/15*15/9 =1/9 [4一(3/4一3/8)]×4/29 =[4-3/8]*4/29 =29/8*4/29 =1/2

①(-7/12+1/4-5/6)×(-24) =7/12×24-1/4×24+5/6×24 =14-6+20 =28 ②5/12×(-1又1/2)×(-8/15)×2/3 =(5/12×8/15)×(1又1/2×2/3) =2/9×1 =2/9 ③4/5×(-5/13)-3/5×(-5/13)-1/5×(-5/13) =5/13×(-4/5+3/5+1/5) =5/13×0 =0

13/15 23/30 1/2 29/24 39/30 1/72

4/5×(-5/4) =-4/5×5/4 =-1 4/5X(-25/6)X(-7/10) =4/5X25/6X7/10 =(4X25X7)/(5X6X10) =(100X7)/(3X100) =7/3 (-24/13)X(-16/7)X0X4/3 =0 5/4X(-1.2)X(-1/9) =5/4X1.2X1/9 =5/4X6/5X1/9 =3/2X1/9 =2/3 (-3/7)X(-1/2)X(-8/15) = -3/7X1/2X8/15 = -(...

8/15×[5/6÷(7/9-1/3)] =8/15 × (5/6 × 9/4) =8/15 × 15/8 =1

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