Tuyển Cộng tác viên Hoc24 nhiệm kì 28 tại đây: https://forms.gle/GrfwFgzveoKLVv3p6
\(\left(\sqrt{14}-3\sqrt{2}\right)^3+6\sqrt{28}\)
\(=\left(\sqrt{14}\right)^2-2\cdot3\sqrt{2}\cdot\sqrt{14}+\left(3\sqrt{2}\right)^2+6\cdot2\sqrt{7}\)
\(=14-6\sqrt{28}+9\cdot2+12\sqrt{7}\)
\(=14-6\cdot2\sqrt{7}+18+12\sqrt{7}\)
\(=\left(14+18\right)+\left(12\sqrt{7}-12\sqrt{7}\right)\)
\(=32\)
Bài 1:Tìn ĐKXĐ
a.\(\sqrt{\dfrac{2}{^{^{^{ }}}x^2}}\)
b.\(\sqrt{\dfrac{-3}{3x+5}}\)
Bài 2:
a.\(\dfrac{2+\sqrt{2}}{1+\sqrt{2}}\)
b.\(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right)\sqrt{7}+7\sqrt{8}\)
c,\(\left(\sqrt{14}-3\sqrt{2}\right)^2+6\sqrt{28}\)
Trả lời giúp mình với ạ!Mình cảm ơn nhiều!
Rút gọn biểu thức
a) \(\left(\sqrt{14}-3\sqrt{2}\right)^2+6\sqrt{28}\)
b) \(2\sqrt{20}-3\sqrt{20}+\sqrt{125}\)
Thực hiện phép tính:
a)\(\left(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}\right).\frac{1}{\sqrt{6}}\)
b) \(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
c) \(\frac{\sqrt{5-2\sqrt{6}}+\sqrt{8-2\sqrt{15}}}{\sqrt{7+2\sqrt{10}}}\)
d) \(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right).\sqrt{7}+7\sqrt{8}\)
Thực hiện phép tính:
\(a,\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right)\cdot\sqrt{7}+7\sqrt{8}\)
\(b,\left(\sqrt{8}-3\sqrt{2}+\sqrt{10}\right)\cdot\left(\sqrt{2}-3\sqrt{0.4}\right)\)
\(c,\left(15\sqrt{50}+5\sqrt{200}-3\sqrt{450}\right):\sqrt{10}\)
\(d,\sqrt{6+2\sqrt{5}}+\sqrt{6-2\sqrt{5}}\)
\(e,\sqrt{11+6\sqrt{2}}-\sqrt{11-6\sqrt{2}}\)
\(f,\sqrt[3]{5\sqrt{2}+7}-\sqrt[3]{5\sqrt{2}-7}\)
\(g,\sqrt[3]{20+14\sqrt{2}}+\sqrt[3]{20-14\sqrt{2}}\)
\(h,\sqrt[3]{26+15\sqrt{3}}-\sqrt[3]{26-15\sqrt{3}}\)
Thực hiện phép tính:
a) \(\left(\sqrt{14}-3\sqrt{2}\right)^2+6\sqrt{28}\)
b) \(\left(3\sqrt{5}+2\sqrt{3}\right)\sqrt{5}-\sqrt{60}\)
Tính Giá Trị biểu thức
A = \(\left(3+\sqrt{5}\right).\left(\sqrt{14-6\sqrt{5}}\right)\)
B = \(_{\frac{2}{3+\sqrt{7}}+\frac{\sqrt{28}}{2}-2}\)
Rút gọn các biểu thức sau:
a) \(\left(\sqrt{8}-3\sqrt{2}+\sqrt{10}\right)\left(\sqrt{2}-3\sqrt{0,4}\right)\) b) \(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right).\sqrt{7}+7\sqrt{8}\)
c) \(2\sqrt{\left(\sqrt{2}-3\right)^2}+\sqrt{2\left(-3\right)^2}-5\sqrt{\left(-1\right)^4}\) d) \(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
Rút Gọn
A. \(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right)\)\(\sqrt{7}\)+\(7\sqrt{8}\)
B.\(\sqrt{16a}+2\sqrt{40a}-3\sqrt{90a}\)
C.\(\sqrt{\left(2\sqrt{6}-3\right)^2}+\sqrt{15-6\sqrt{6}}\)
D.\(\left(\sqrt{3}\right)+1\sqrt{4-2\sqrt{2}}\)
E.2\(2\sqrt{3}+\sqrt{48}-\sqrt{75}-\sqrt{243}\)
a : \(\sqrt{\left(2\sqrt{2}-1\right)^2}-\sqrt{17+12\sqrt{2}}\)
b : \(\sqrt{\left(2-\sqrt{5}\right)^2}+\sqrt{14-6\sqrt{5}}\)
c : \(\sqrt{\left(4-3\sqrt{2}\right)^2}-\sqrt{19+6\sqrt{2}}\)
