求100²-99²+98²-97²…+2²-1²的和
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求100²-99²+98²-97²…+2²-1²的和
求100²-99²+98²-97²…+2²-1²的和
求100²-99²+98²-97²…+2²-1²的和
100²-99²+98²-97²…+2²-1²
=(100²-99²)+(98²-97²)…+(2²-1²)
=(100+99)x(100-99)+(98+97)x(98-97)+...+(2+1)x(2-1).平方差公式的运用
=100+99+98+97+...+2+1
=5050