![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
2/3+4/5+8/9+16/17+32/33+64/65+128/129+256/257+512/513=?
2/3+4/5+8/9+16/17+32/33+64/65+128/129+256/257+512/513
=(1+2/1)+(1+4/1)+(1+8/1)+(1+16/1)+(1+32/1)+(1+64/1)+(1+128/1)+(1+256/1)+(1+512/1)
=(1+1+1+1+1+1+1+1+1)+(2/1+4/1+8/1+16/1+32/1+64/1+128/1+256/1+512/1)
=9+512/511
=9 and 511 out of 512
If the number of people in class 51 is 2 / 5 more than that in class 52, how many points is the number of people in class 52 less than that in class 51?
Class one X class two Y, x = y (1 + 2 / 5), y = x / (1 + 2 / 5) = x * 5 / 7, so 2 / 7 is less
How many people are there in a two in five class with one in five?
24 × 1 / 8 △ 1 / 12 = 36 persons
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