\(\left(a^2+ab+b^2\right)\cdot\left(a^2-ab+b^2\right)-\left(a^4+b^4\right)\)

\(=\left(a^4+b^4+2a^2b^2-a^2b^2\right)-a^4-b^4\)

\(=a^2b^2\)

Giống: chúng đều là vật sống

Ko giống: cây khế là thực vật,gà là gia cầm,thỏ là thú,cá sống dưới nước.

1C 2B 3D 4A 5B

lx r

Lỗi rùi bn

a) \(1\dfrac{2}{3}-\left(\dfrac{1}{2}x-0,75\right)=-\dfrac{1}{6}\)

\(\Rightarrow\dfrac{5}{3}-\dfrac{1}{2}x+\dfrac{3}{4}=-\dfrac{1}{6}\)

\(\Rightarrow\dfrac{29}{12}-\dfrac{1}{2}x=-\dfrac{1}{6}\)

\(\Rightarrow\dfrac{1}{2}x=\dfrac{29}{12}+\dfrac{1}{6}\)

\(\Rightarrow\dfrac{1}{2}x=\dfrac{31}{12}\)

\(\Rightarrow x=\dfrac{31}{12}:\dfrac{1}{2}\)

\(\Rightarrow x=\dfrac{31}{6}\)

c) \(\left(x-1\dfrac{1}{2}\right)-\dfrac{3}{12}=\left(-\dfrac{1}{2}\right)^2\)

\(\Rightarrow\left(x-\dfrac{3}{2}\right)-\dfrac{3}{12}=\dfrac{1}{4}\)

\(\Rightarrow x-\dfrac{7}{4}=\dfrac{1}{4}\)

\(\Rightarrow x=\dfrac{1}{4}+\dfrac{7}{4}\)

\(\Rightarrow x=\dfrac{8}{4}\)

\(\Rightarrow x=2\)

tự vẽ hình nha bạn

a.AC=\(\sqrt{BC^2-AB^2}=\sqrt{10^2-6^2}=8\) cm (pytago)

\(\Rightarrow\)chu vi tam giác ABC là: 6+10+8=24 cm

b.\(HB=\sqrt{AB^2-AH^2}=\sqrt{6^2-AH^2}\left(pytago\right)\\ HC=\sqrt{AC^2-AH^2}=\sqrt{8^2-AH^2}\left(pytago\right)\\ \Rightarrow HB< HC\)

okela

1B 2C 3A 4A 5C 6B 7D 8B 9D 10B 11B 12B 13D 14B 15B 16A 17C 18B 19A 20C