Toán thực tế (039)
Tại Mỹ, hầu hết các quy tắc xây dựng đều giới
hạn độ dốc của mái nhà đến $\dfrac{4}{3}$ (như hình).
Một người thợ xây muốn đặt một thanh giằng chống đỡ mái nhà từ điểm H vuông góc
với AB. Tìm chiều dài của thanh giằng này.
hạn độ dốc của mái nhà đến $\dfrac{4}{3}$ (như hình).
Một người thợ xây muốn đặt một thanh giằng chống đỡ mái nhà từ điểm H vuông góc
với AB. Tìm chiều dài của thanh giằng này.
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