某校把一块形状为直角三角形的废地开辟为生物,如图,∠ABC=90°,AC=80m,BC=60m若线段CD是一条小渠,且D点在边AB上,已知水渠的造价为10元/米,问D点在距离A点多远处时,水渠的造价最低?最低造价是多
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![某校把一块形状为直角三角形的废地开辟为生物,如图,∠ABC=90°,AC=80m,BC=60m若线段CD是一条小渠,且D点在边AB上,已知水渠的造价为10元/米,问D点在距离A点多远处时,水渠的造价最低?最低造价是多](/uploads/image/z/3608001-9-1.jpg?t=%E6%9F%90%E6%A0%A1%E6%8A%8A%E4%B8%80%E5%9D%97%E5%BD%A2%E7%8A%B6%E4%B8%BA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E5%BA%9F%E5%9C%B0%E5%BC%80%E8%BE%9F%E4%B8%BA%E7%94%9F%E7%89%A9%2C%E5%A6%82%E5%9B%BE%2C%E2%88%A0ABC%3D90%C2%B0%2CAC%3D80m%2CBC%3D60m%E8%8B%A5%E7%BA%BF%E6%AE%B5CD%E6%98%AF%E4%B8%80%E6%9D%A1%E5%B0%8F%E6%B8%A0%2C%E4%B8%94D%E7%82%B9%E5%9C%A8%E8%BE%B9AB%E4%B8%8A%2C%E5%B7%B2%E7%9F%A5%E6%B0%B4%E6%B8%A0%E7%9A%84%E9%80%A0%E4%BB%B7%E4%B8%BA10%E5%85%83%2F%E7%B1%B3%2C%E9%97%AED%E7%82%B9%E5%9C%A8%E8%B7%9D%E7%A6%BBA%E7%82%B9%E5%A4%9A%E8%BF%9C%E5%A4%84%E6%97%B6%2C%E6%B0%B4%E6%B8%A0%E7%9A%84%E9%80%A0%E4%BB%B7%E6%9C%80%E4%BD%8E%3F%E6%9C%80%E4%BD%8E%E9%80%A0%E4%BB%B7%E6%98%AF%E5%A4%9A)
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