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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÷【(1/12+1/15+1/20)×1/2】 =2÷【(1/12+1/15+1/20)】 =(2x60)÷【(1/12+1/15+1/20)×60】 =120÷【(5+4+3】 =120÷12 =10

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

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

12-(1/15+1/20)×105 =12-7/60×105 =5-12.25 =-7.25

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!

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

=5×2/15+5×1/20-5/12 =2/3-1/4-5/12 =8/12-3/12-5/12 =0

5/12加4/15减1/20的差等于多少计算过程 5/12加4/15减1/20的差 =5/12+(4/15-1/20) =25/60+16/60-3/60 =37/60 直接计算

整数部分是 0

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