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thienngotu234
2 năm trước
Lúc 7h sáng,một xe lửa khởi hành từ A dự kiến đến B vào lúc 17h40p.Nhưng thực tế xe đi với vận tốc nhỏ hơn vận tốc dự kiến là 10km/giờ.Nên xe đã đến B vào lúc 19h48p.Tính quãng đường AB và vận tốc dự kiến của xe Cho biểu thức A=($\frac{9x}{x³-9x}$+$\frac{1}{x+3}$:($\frac{x-3}{x²-3x}$-$\frac{x}{3x+9}$) a)Tìm ĐKXĐ,rút gọn A b)Tính A khi x=4 c)Tìm x để A=5
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