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Prove that (0.85xx 0.85xx 0.85 +0.15xx 0...

Prove that `(0.85xx 0.85xx 0.85 +0.15xx 0.15xx 0.15)/(0.85xx 0.85-0.85xx 0.15+0.15xx 0.15)=1`.

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Given expression ` =((a^3+b^3))/((a^2-ab+b^2))=(a+b), " where " a=0.85 and b=0.15`.
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