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phngng835
2 năm trước
Câu 6: (1 điểm) Trong mành đất hình chữ nhật có đo dài các cạnh là x (cm) và y (cm), người ta đào một cái giếng hình tròn có bán kính là r (cm). Tính diện tích S còn lại của mảnh đất theo x, y và r. Diện tích S có phải là một đa thức không? (biết hình tròn có bán kinh R thì diện tích S= πR²) GIúp mik câu này vs mọi người
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