Tính :
\(A=35+335+3335+...+333...35\left(99\text{ chữ số 3}\right)\)
tinh gia tri bieu thuc a = \(\frac{1}{1\times2}+\frac{1}{2\times3}+...+\frac{1}{99\times100}\)
cho tana+cota+3 tinh gia tri bieu thuc A=sina*cosa
\(\sqrt{\sqrt{5}-\sqrt{3-\sqrt{29-6\sqrt{20}}}}\)
So cuoi la 20 nhe
Tinh gia tri bieu thuc
Btinh gia tri bieu thuc B=(1/2^2 -1) . ( 1/3^2-1) .(1/4^2 -1) . ... .(1/98 ^2 -1) . (1/99^2 -1)
tinh gia tri bieu thuc
n = ( 1 + can 3 + can 5 ) * ( 1 + can 3 - can 5)
\(2\sqrt{3+\sqrt{5-\sqrt{13+\sqrt{48}}}}\)
tinh gia tri bieu thuc
tinh gia tri cua bieu thuc A=can3x^2-2xcan3+1 voi can3-1/can3
\(\sqrt{21-6\sqrt{6}}\)
tinh gia tri bieu thuc