=5600  minh

Tăng lên 4 lần

Vậy ta chọn phương án B

Vì hai cạnh là tăng lên 4 lần thì diện tích cũng tăng lên 4 lần

tk nhé

5 số thập phân lớn hơn 5, 7 và bé hơn 5, 8 là :

5, 72   ;   5, 73   ;  5, 74  ;   5, 75   ;  5, 76

Ta có

\(\frac{1}{1+x+xy}=\frac{1}{1+x+\frac{1}{z}}=\frac{z}{z+xz+1}\)

\(\frac{1}{1+y+yz}=\frac{1}{1+\frac{1}{xz}+yz}=\frac{xz}{xz+1+z}\)

Từ đó ta có

A = \(\frac{z}{1+z+xz}+\frac{xz}{1+z+xz}+\frac{1}{1+z+xz}\)

= \(\frac{1+z+xz}{1+z+xz}=\:1\)

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Tuổi bố 40 tuổi 

Tuổi mẹ 32 tuổi

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