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| 1. |
\begin{array}{l}{\frac{137 \times 137+137 \times 133+133 \times 133}{137 \times 137 \times 137-133 \times 133 \times 133}} \\ {a^{3}-b^{3}=(a-b)\left(a^{2}+b^{2}+a b\right)}\end{array} |
| Answer» | |