\(\dfrac{2^4\cdot5^2\cdot11^2\cdot7}{2^3\cdot5^3\cdot7^2\cdot11}=2\cdot\dfrac{1}{5}\cdot11\cdot\dfrac{1}{7}=\dfrac{22}{35}\)

\(1,\\ a,=\dfrac{\sqrt{\left(\sqrt{a}-\sqrt{b}\right)^2}}{\sqrt{\left(\sqrt{a}-\sqrt{b}\right)}}=\sqrt{\dfrac{\left(\sqrt{a}-\sqrt{b}\right)^2}{\sqrt{a}-\sqrt{b}}}=\sqrt{\sqrt{a}-\sqrt{b}}\\ b,=\dfrac{\sqrt{\left(\sqrt{x}-\sqrt{3}\right)\left(\sqrt{x}+\sqrt{3}\right)}}{\sqrt{\sqrt{x}+\sqrt{3}}}\cdot\dfrac{\sqrt{3}}{\sqrt{\sqrt{x}-\sqrt{3}}}\\ =\sqrt{3}\\ c,=2y^2\cdot\dfrac{x^2}{\left|2y\right|}=\dfrac{2x^2y^2}{-2y}=-x^2y\\ d,=5xy\cdot\dfrac{\left|5x\right|}{y^2}=\dfrac{-25x^2y}{y^2}=\dfrac{-25x^2}{y}\)

Bài 2: 

a: Ta có: \(A=\left(3\sqrt{18}+2\sqrt{50}-4\sqrt{72}\right):8\sqrt{2}\)

\(=\left(9\sqrt{2}+10\sqrt{2}-24\sqrt{2}\right):8\sqrt{2}\)

\(=\dfrac{-5\sqrt{2}}{8\sqrt{2}}=-\dfrac{5}{8}\)

b: Ta có: \(B=\left(-4\sqrt{20}+5\sqrt{500}-3\sqrt{45}\right):\sqrt{5}\)

\(=\left(-8\sqrt{5}+50\sqrt{5}-9\sqrt{5}\right):\sqrt{5}\)

\(=49\)

Bạ tự vẽ hình nhé!

a) Tia Ay nằm giữa . Vì xAy < xAz.

b) Số đo của zAy là:                   zAy= xAz - xAy =80-40= 40.     c) Có. Vì Ay chia xAz ra thành 2 góc = nhau                               d) Bạn vẽ ra rồi tự làm nhé

bài đâu bạn

a) 25^{n + 2} : 5^{n + 1}

 = (5²)^{(n + 2)} : 5^{n + 1}

 = 5^{2.(n + 2)}  : 5^{n + 1}

 = 5^{2n + 4} : 5^{n + 1}

= 5^{2n + 4 - (n + 1)}

= 5^{n + 3}

b) 8^{n + 5} : 4^{n + 1}

= (2³)^{(n + 5)} : (2²)^{(n + 1)}

= 2^{3(n + 5)} : 2^{2(n + 1)}

= 2^{3n + 15} : 2^{2n + 2}

= 2^{3n + 15 - (2n + 2)}

= 2^{n + 13}

đề câu c cũng như câu a thôi bạn

Vân Trình, Hùng Nam Yến, Khuê Hoa nữ tử, Tú Gầy,...

3. are there any eggs?-No, there aren't some

4.is there any salt?- yes, there is any

5.are there any carrots?-yes, there are some

6.are there any apples?-no there aren't some

7.is there any suger?-yes, there is any

8.are there any cakes?-no there aren't some

9.is there any butter?-no. there isn't any

10. is there any mineral water?- yes. there is any