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abc=250 nha bạn

45 câu đúng nha bạn

Giải:

\(\sqrt{42-10\sqrt{17}}+\sqrt{33-8\sqrt{17}}\)

\(=\sqrt{\left(5-\sqrt{17}\right)^2}+\sqrt{\left(4-\sqrt{17}\right)^2}\)

\(=\left|5-\sqrt{17}\right|+\left|4-\sqrt{17}\right|\)

\(=5-\sqrt{17}+\sqrt{17}-4\)

\(=1\)

Vậy ...

đỏ 3

xanh 2

vàng 10

đụ má nó

\(A=sin23^0-cos67^0=cos67^0-cos67^0=0\)

Vậy ...

\(B=\dfrac{tan70^0.tan45^0.tan20^0}{cos70^0.cos45^0.cos20^0}\)

\(\Leftrightarrow B=\dfrac{tan70^0.tan45^0.tan20^0}{tan70^0.cos45^0.tan20^0}=1\)

Vậy ...

Đs:10 bạn nha