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11×2+12×3+13×4+⋯+199×100= ? \large \frac{1}{1 \times 2}+\frac{1}{2 \times 3}+\frac{1}{3 \times 4}+\cdots +\frac{1}{99 \times 100} = \ ? 1×21+2×31+3×41+⋯+99×1001= ?
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