5/1:8/1:20/1:30/1 = 24:15:6:4
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=R
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
能简算要简算:8/15×3/4-1/6÷1/2=?5/4×5/6+1/6×5/4=?32.6×4/5+32.6×20%=
脑筋急转弯 1=5 ,2=10,3=15,4=20,5=?,6=30,7=35,8=40,9=45
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)
简算:(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)=?
(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)
简便运算(8/9-5/6)÷(1/6+2/3)=? 25/24÷[(15/8-3/4)×20/27]=要过程
36的因数:60的因数:1 2 3 4 5 6 7 8 9 10 12 15 16 18 20 24 30 36 60
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1
A={1/6,1/12.1/20,1/30,1/42},B={1/8,1/24,1/48,1/80}从每组中各取出一个数
2*4*6+4*8*12+6*12*8+8*12*24分之1*3*5+2*6*10+3*9*15+4*12*20怎么做?