30 points reward, to calculate! If you look at each group of formulas below, what are their rules? 1.1/1×2=1/1-1/2 1/2×3=1/2-1/3 1/3×4=1/3-1/4…… 2.1/1+1/2=1+2/1×2 1/2+1/3=2+3/2×3 1/3+1/4=3+4/3×4…… According to the above rule, can you calculate the following questions? 1.1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 2.11/30-9/20+7/12-5/6+1/2

30 points reward, to calculate! If you look at each group of formulas below, what are their rules? 1.1/1×2=1/1-1/2 1/2×3=1/2-1/3 1/3×4=1/3-1/4…… 2.1/1+1/2=1+2/1×2 1/2+1/3=2+3/2×3 1/3+1/4=3+4/3×4…… According to the above rule, can you calculate the following questions? 1.1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 2.11/30-9/20+7/12-5/6+1/2

1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10=1/2-1/10=2/511/...

How to calculate this mathematical reasoning? 1,1,2,3,5,8,21,

1+1=2
1+2=3
2+3=5
3+5=8
5+8=13
8+13=21
13+21=34

How to calculate this mathematical reasoning? 2 / 3, 5 / 8, 13 / 21,

34/55
Numerator = sum of numerator and denominator of the previous number
Denominator = the denominator of the previous number + the numerator of this number