Câu nào dưới đây thể hiện mối quan hệ chặt chẽ giữa miền núi với đồng bằng nước ta ? A. Đồng bằng có địa hình bằng phẳng, miền núi có địa hình cao hiểm trở.
B. Đồng bằng thuận lợi cho cây lương thực, miền núi thích hợp cho cây công nghiệp.
C. Những sông lớn mang vật liệu bào mòn ở miền núi bồi đắp, mở rộng đồng bằng.
D. Sông ngòi phát nguyên từ miền núi cao nguyên chảy qua các đồng bằng.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

Dis the answer you perception is how you see the world 

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