简便方法计算800²-1600×789+789²800²-1600×789+789²
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简便方法计算800²-1600×789+789²800²-1600×789+789²
简便方法计算800²-1600×789+789²
800²-1600×789+789²
简便方法计算800²-1600×789+789²800²-1600×789+789²
800²-1600×789+789²
=800²-2×800×789+789²
=(800-789)²
=11²
=121