B1 : Rút gọn :6xy.sqrt{frac{9x^2}{16y^2}} left(x 0;yne0right)sqrt{frac{4+20a+25a^2}{b^4}}left(b 0;agefrac{-2}{5}right)left(m-nright).sqrt{frac{m-n}{left(m-nright)^2}}left(0 m nright)B2 : Tính :1.left(2sqrt{3}-sqrt{12}right):5sqrt{3}2.sqrt{frac{317^2-302^2}{1013^2-1012^2}}3.sqrt{27left(1-sqrt{3}right)^2}:3sqrt{75}4.left(5sqrt{frac{1}{5}}+frac{1}{2}sqrt{20}-frac{5}{4}sqrt{frac{4}{5}}+sqrt{5}right):2sqrt{5}
Đọc tiếp
B1 : Rút gọn :
\(6xy.\sqrt{\frac{9x^2}{16y^2}}\) \(\left(x< 0;y\ne0\right)\)
\(\sqrt{\frac{4+20a+25a^2}{b^4}}\)\(\left(b< 0;a\ge\frac{-2}{5}\right)\)
\(\left(m-n\right).\sqrt{\frac{m-n}{\left(m-n\right)^2}}\)\(\left(0< m< n\right)\)
B2 : Tính :
\(1.\left(2\sqrt{3}-\sqrt{12}\right):5\sqrt{3}\)
\(2.\sqrt{\frac{317^2-302^2}{1013^2-1012^2}}\)
\(3.\sqrt{27\left(1-\sqrt{3}\right)^2}:3\sqrt{75}\)
\(4.\left(5\sqrt{\frac{1}{5}}+\frac{1}{2}\sqrt{20}-\frac{5}{4}\sqrt{\frac{4}{5}}+\sqrt{5}\right):2\sqrt{5}\)
