Rút gọn các biểu thức sau :1 ) \(\sqrt{80}\)+\(\sqrt{20}\)-\(\sqrt{5}\)-5\(\sqrt{45}\)2 ) 4\(\sqrt{20}\)-3\(\sqrt{125}\)+5\(\sqrt{45}\)-15\(\sqrt{\frac{1}{5}}\)3 ) (7\(\sqrt{48}\)+3\(\sqrt{27}\)-2\(\sqrt{12}\)) :\(\sqrt{3}\)4 ) \(\sqrt{343a}\)+\(\sqrt{63a}\)-\(\sqrt{28a}\)\(\left(a\ge0\right)\)5 ) -\(\sqrt{36a}\)-\(\frac{1}{3}\).\(\sqrt{54a}\)+\(\frac{1}{5}\).\(\sqrt{150a}\)\(\left(a\ge0\right)\)6...
Đọc tiếp
Rút gọn các biểu thức sau :
1 ) \(\sqrt{80}\)+\(\sqrt{20}\)-\(\sqrt{5}\)-5\(\sqrt{45}\)
2 ) 4\(\sqrt{20}\)-3\(\sqrt{125}\)+5\(\sqrt{45}\)-15\(\sqrt{\frac{1}{5}}\)
3 ) (7\(\sqrt{48}\)+3\(\sqrt{27}\)-2\(\sqrt{12}\)) :\(\sqrt{3}\)
4 ) \(\sqrt{343a}\)+\(\sqrt{63a}\)-\(\sqrt{28a}\)\(\left(a\ge0\right)\)
5 ) -\(\sqrt{36a}\)-\(\frac{1}{3}\).\(\sqrt{54a}\)+\(\frac{1}{5}\).\(\sqrt{150a}\)\(\left(a\ge0\right)\)
6 ) \(2\)\(\sqrt{48}\) -\(4\)\(\sqrt{27}\)+\(\sqrt{75}\)+\(\sqrt{12}\)
1,\(4\sqrt{5}+2\sqrt{5}-\sqrt{5}-15\sqrt{5}=-10\sqrt{5}\)
2,\(8\sqrt{5}-15\sqrt{5}+15\sqrt{5}-3\sqrt{5}=5\sqrt{5}\)
3,\(\left(28\sqrt{3}+9\sqrt{3}-4\sqrt{3}\right):\sqrt{3}=33\)
4,\(7\sqrt{7a}+3\sqrt{7a}-2\sqrt{7a}=8\sqrt{7a}\)
5,\(-6\sqrt{a}-\sqrt{6a}+\sqrt{6a}=-6\sqrt{a}\)
6,\(8\sqrt{3}-12\sqrt{3}+5\sqrt{3}+2\sqrt{3}=3\sqrt{3}\)