`sqrt{54 - 18sqrt{5}}`
`= sqrt{54 - 2.3. 3sqrt{5}}`
`= sqrt{45 - 2.3. 3sqrt{5} + 9}`
`= sqrt{(3sqrt{5})^2 - 2.3. 3sqrt{5} + 3^2}`
`= sqrt{(3sqrt{5}- 3)^2}`
`= |3sqrt{5}- 3|`
`= 3sqrt{5}- 3`
giup minh cau nay voi : cho tam giac ABC vuong tai A voi cac duong phan giac trong BM va CN .chung minh bat dang thuc (MC+MA)(NB+NA)/MA.NA >= 3+2√2
voi a,b,c,d, la cac so duong thoa man a*b = c*d =1 chung minh bat dang thuc : ( a+b )*( c+d ) +4 >= 2*( a+b+c+d ) cac ban oi giup minh voi OK
tim gtnn , gtln của /x-can2/+/y-1/ voi /x/+/y/=5...ho mk voi,mk dang can gap
voi a,b,c,d la cac so duong thoa man a*b = c*d = 1. Chung minh bat dang thuc ( a+b )*( c+d ) + 4 >= 2( a+b+c+d )
cho day so voi cac so hang tong quat duoc cho boi cong thuc;
Un=\(\frac{\left(13+\sqrt{3}\right)^n-\left(13-\sqrt{3}\right)n}{2\sqrt{3}}\) voi n=1,2,3,.........
tinh U1,U2,U3,U4,U5,U6,U7,U8,U9,U10
Lap cong thuc truy hoi tinh Un+1 theo Un va Un-1
Lap quy trinh an phim lien tuc tinh Un+1 theo Un va Un-1
giai ho voi
tim min cua
\(A=\frac{\left(x+y+1\right)^2}{xy+x+y}+\frac{xy+x+y}{\left(x+y+1\right)^2}\) (voi x,y la so thuc duong)
chung minh bat dang thuc x^4 + 5 > x^2 + 4x
giai pt nay giup em voi dang can gap x-\(\sqrt{\left(x-2\right)}\)+4=0
Mot cua hang thuc hien chinh sach giam gia nhu sau , giam 10% / ao ,20%/ quan , 30%/ giay , biet khi mua bao gom 1 ao , 1 quan , 1 giay thi giam them 5% , ban A mua 3 cai ao gia 300000/ cai , 2 cai quan 250000/cai , 1 doi giay 1000000/doi ( gia chua giam ). Hoi ban tra bao nhieu tien ?
AI BIET GIAI NHANH GIUP MINH NHE , MINH DANG CAN GAP LAM ! CAM ON NHIEU
1phầnx +1 phầny >=4phần x+y. Dau trong bat dang thuc xay ra khi nao
tach thanh hang dang thuc ho em voi
