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[(1/15+1/20)*12%1]*(1/15)怎么算等于多少

[(7/60)*12-1]*(1/15) =(7/5-1)*(1/15) =(2/5)*(1/15) =2/75

1÷(1/15+1/10)=6 1÷(1/15+1/10)=6 1÷(1/20+1/30)=12

20-2/15+1/12 =20-(2/15-1/12) =20-(8/60-5/60) =20-1/20 =19又19/20

15/12加(4/15-1/20) = 5/4 - 1/20 + 4/15 = (25/20-1/20) + 4/15 = 24/20+4/15 = 6/5+4/15 = 18/15+4/15 = 22/15

1÷(1/15+1/12) =1÷3/20 =1×20/3 =20/3

60×(1/12+1/15+1/20) =60×1/12+60×1/15+60×1/20 =5+4+3 =12

5/12+4/15-1/20的和简便计算 =25/60+16/60-3/60 =38/60 =19/30

(1)30;35;40;(2)21;24;27

5x2/15+1/20-5/12 =2/3-5/12+1/20 =(8-5)/12+1/20 =1/4+1/20 =3/10 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

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