8 minus 9 out of 10 is more than 4 out of 5,

8 minus 9 out of 10 is more than 4 out of 5,

(8-9/10)-4/5
=8-9/10-8/10
=8-17/10
=6 and 3 / 10

-What is 2 and 3 out of 5 minus 8 and 2 out of 5

-Two and three fifths minus eight and two fifths
-2(3/5)-{-8(2/5)}
=-13/5-(-42/5)
=29/5
=5 and four fifths = 5.8

Observe the following numbers and fill in the appropriate numbers on the horizontal line according to a certain rule: 1,3 / 4,5 / 9,7 / 16___ ,___ Then the nth number is____ How to fill in?

The first one can be regarded as 1 / 1, so 1. Numerator 1, denominator 1 = 1 & # 178; 2. Numerator 3 = 1 + 2 × 1, denominator 4 = 2 & # 178; 3. Numerator 5 = 1 + 2 × 2, denominator 9 = 3 & # 178; 4. Numerator 7 = 1 + 2 × 3, denominator 16 = 4 & # 178 And so on five, numerator 1 + 2 × 4 = 9, denominator 5 & # 178; = 25 = = < 9 / 25 six, numerator 1 + 2