One half plus five sixths plus eleven twelfth plus nineteen twenties plus twenty-nine thirties. To 9899 9900 It's the method, not the calculation

Using split term elimination method
=1-1/(1*2)+1-1/(2*3)+1-1/(3*4)+...+1-1/(99*100)
=99-(1-1/2+1/2-1/3+1/3-1/4+...+1/99-1/100)
=99-(1-1/100)=9801/100

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1. 12+56+1112+1920+… +98999900=______ ．
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7. (): 24 = 3 / 8 = 12 divided by () = () 24 / 8
8. 8 / 3 = 30 = 24 / 3 = 4 / 3
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