(15-3t)²=(15-5t)²+5²
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咨询记录 · 回答于2023-07-12
(15-3t)²=(15-5t)²+5²
(15-3t)² = (15-3t)(15-3t) = 225 - 45t - 45t + 9t² = 225 - 90t + 9t²(15-5t)² + 5² = (15-5t)(15-5t) + 25 = 225 - 75t - 75t + 25 + 25 = 275 - 150t + 9t²225 - 90t + 9t² = 275 - 150t + 9t²225 - 90t = 275 - 150t225 + 60t = 27560t = 50t = 50/60 = 5/6 or 0.833
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