trong 1 hệ sinh thái có các sinh vật sau: cỏ, châu chấu. ếch, chuột, thỏ, rắn, cú, vi sinh vật. Theo em cú có thể nằm trong những chuỗi thức ăn nào

x + 630 = 589 - 120

x + 630 = 469

x = 469 - 630

x = - 161

nêu các tác nhân chủ yếu gây ô nhiễm môi trường? Vai trò của rừng trong việc hạn chế ô nhiễm môi trường

trình bày đặc điểm cơ bản của quần thể sinh vật? Nêu ý nghĩa sinh thái và ý nghĩa thực tiễn khi nghiên cứu đặc trưng đó

Cảm ơn nhé.Hì hì.

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mik bik là tính bằng máy tính là ra nhưng có điều cô mk nói là ko được sử dụng máy tính

điều thứ hai là phải ra một kết quả là số nguyên giống như là 2^4 = 16 vậy. 

đổi 0,48km=480m

chiều rộng là

480:5x3=288 m

chiều dài là

480:5x5=480

diện tích là

480x288=138240 m

đổi 138240m=13,8240 ha

ds

chúc bạn học tốt 

nhớ k mình nha

123 - 5 . ( x + 4 ) = 38

5 . ( x + 4 ) = 123 - 38

5 . ( x + 4 ) = 85

x + 4 = 85 : 5

x + 4 = 17

      x = 17 - 4

 => x = 13