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now use this idea to calculate these wit...

now use this idea to calculate these without pen and paper `4.2-(3.2-2.3)`

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` 4.2-(3.2-2.3) =(4.2-3.2)+2.3 =1+2.3 .nive 3 w =3.3 `
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Calculate the oxidation number of 'P' in 'PO_4^(-3), HPO_3^(2-)'

Note the specialities of fractional numbers. It can be written as 1-1/2=(2-1)/(1xx2)=1/(1xx2) 1/2-1/3=(3-2)/(2xx3)=1/(2xx3) 1/3-1/4=(4-3)/(3xx4)=1/(3xx4) now answer the following. 1/(1xx2)+1/(2xx3)+1/(3xx4)+....(1)/(99xx100)= ____