bai tham khao =))))))))))))

ai cx nham vs nhan chia the

ko tin cu tinh ra roi bt

 sai r `2^40 : 2^20 = 2^(40-20) = 2^20`

=> xem lai di 

cai nay chi dung vs phep nhan hoac chia thoi

cong tru ko dung dau

x2+ \(\sqrt{x^4-8x^2}+16\) = x² + \(\sqrt{\left(x^2-4\right)^2}\) = x² + \(\left|x^2-4\right|\) = x² + x²  - 4 = 2x² - 4 

dang vt kq ma nhan du the

-3²⁰ + 3⁴⁰ = 3⁴⁰ - 3²⁰ = 3²⁰ . (3²⁰ - 1) = 3486784401 . 3486784400 = 12157665455570144400 

câu kia mik ms sửa nhé 

2⁴⁰  -  2²⁰ = 2^{(40 - 20 )} = 2²⁰ 

=))))))))))