德标角式截止阀:2/3 1/3 1 2/5 英语怎么说?
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分数怎么说?
two thirds,one third,two fifths
分子用基数词,分母用序数词,分子大于1的,分母用复数
tow over three
one over three
tow over three
two thirds,one third,two fifths
分子用基数词,分母用序数词,分子大于1的,分母用复数
1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100)
1+1/1+2+1/1+2+3+......+1/1+2+3+......+10
3/2=2+1/1*2=1/1+1/2
(1-1/2^2)(1-1/3^2)....(1-1/10^2)
(1-1/2^2)(1-1/3^2)....(1-1/10^2)
1/1*2+1/2*3+1/3*4+...+1/2000*2001
1/(1*2)+1/(2*3)+1/(3*4)+..+1/(99*100)
1/2,1/3,2/3,6/3,( ),18/3
1/(2*2)+1/(3*3)
3^3+2^3/3^3+1^3=3+2/3+1,