Question

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Answer 1

\(C=\left(2+5+8+\cdot\cdot\cdot+98\right)\cdot\dfrac{1^2+2^2+3^2+4^2-2\cdot3\cdot5}{1-3+5-7+\cdot\cdot\cdot+97-99}\)

\(=\left(2+5+8+\cdot\cdot\cdot+98\right)\cdot\dfrac{1+4+9+16-30}{1-3+5-7+\cdot\cdot\cdot+97-99}\)

\(=\left(2+5+8+\cdot\cdot\cdot+98\right)\cdot\dfrac{0}{1-3+5-7+\cdot\cdot\cdot+97-99}\)

\(=0\)

#\(Toru\)