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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

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

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

1÷(1/15+1/12) =1÷3/20 =1×20/3 =20/3

整数部分是 0

1/3×2=2/3 11/12×1/15×20 =11/12×4/3 =11/9 11/12×1/15×20最大

裂项 1. 1/2=1/(1×2)=1-1/2 1/6=1/(2×3)=1/2-1/3 ...... 1/72=1/(8×9)=1/8-1/9 原式=1-1/2+1/2-1/3+...+1/8-1/9 =1-1/9 =8/9 2. 1/15=1/(3×5)=(1/3-1/5)÷2 1/35=1/(5×7)=(1/5-1/7)÷2 ...... 1/575=1/(23×25)=(1/23-1/25)÷2 原式=(1/3-1/5+1/5-1/...

=(30+10+6+3+2+1)/30 *(30+15+10+5+3+1)/60=1.625

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