Các câu hỏi tương tự
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
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 )
Voi a,b,c la cac so duong thoa man a*b =c*d =1 chung minh (a+b)(c+d) + 4>= 2(a+b+c+d)
cho a,b,c la cac so thuc thoa man a+2b-3b=0 va bc +2ac-3ab=o.chung minh a=b=c
cho a,b,c la cac so thuc thoa man a+2b-3b=0 va bc +2ac-3ab=o.chung minh a=b=c
cho cac so thuc a,b,c la cac so thuc thoa man a+1/b=b+1/c=c+1/a CMR a=b=c
cho nua duong tron (O;R), duong kinh AB. Ke cac tia tiep tuyen Ax, B y cung phia voi nua duong tron doi voi AB. Tu mot diem E tren (O) ke tiep tuyen thu ba cat Ax, By theo thu tu o C,D.
a) cmr CD=AC+BD
b)tinh so dogoc COD
c) cmr AC.BD=R^2
d) goi F la giao diem cua AD va BC, cm EF.CD=AC.BD
1. Cho a,b,c,d la cac so nguyen thoa man \(a^2=b^2+c^2+d^2\)
chung minh rang a.b.c.d + 2015 viet duoc duoi dang hieu cua 2 so chinh phuong.
2. Cho a,b la cac so duong thoa man dieu kien a+b=1. tim gia tri nho nhat cua bieu thuc
\(P=\frac{2+a}{\sqrt{2-a}}+\frac{2+b}{\sqrt{2-b}}\)
cho cac so thuc thoa man a+b+c=6 va 0 =<a,b,c=<4
Tim Max P=a2+b2+c2+ab+ac+bc