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12/15×5/8%2/5的和等于多少

12/15×5/8-2/5的和 =4/5x(5/8-2/5) =4/5x5/8-4/5x2/5 =1/2-8/25 =25/50-16/50 =9/50

1/12 解析: (5/8)×(2/15) =(5×2)/(8×15) =10/120 =1/12

(15/16+5/8)×8/15×1/2 =(15/16+10/16)×4/15 =25/16×4/15 =5/12

5/12×16分之15×24/25=8分之3 计算过程就是通过约分。比如12和24约分,5和25约分,然后2和16约分、15和5约分,最后是8分之3

四分之五

1/4+5/12=2/3 1/4+5/12 =3/12+5/12 =8/12 =2/3 2/3-1/6+1/3=5/6 2/3-1/6+1/3 =2/3+1/3-1/6 =1-1/6 =5/6 8/15-1/5=1/3 8/15-1/5 =8/15-3/15 =5/15 =1/3 4/3+3/8=41/24 4/3+3/8 =32/24+9/24 =41/24 谢谢,请采纳

数列的奇数项组成一个7的等差数列;偶数项也组成一个7的等差数列。 对于第n项,如果n为奇数,那么=5+7×(n-1)/2; 如果n为偶数,那么=8+7×n/2;

十五分之八,三分之十,二分之三

15(x+1/4)=12(x-2/5) 5(x+1/4)=4(x-2/5) 5x+5/4=4x-8/5 x=5/4-8/5 x=25/20-32/20 x=-7/20

(15/8-5/12)×2/5+5/12 =35/24×2/5+5/12 =7/12+5/12 =1(吨)

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