2. Rút gọn:

A=\(\frac{2^{10}.13+2^{10}.65}{2^8.104}\)

B=\(\frac{4^6.9^5.6^9.120}{8^4.3^{12}+6^{11}}\)

1/ Tìm x biết:

a. (2x-1)³= -27

b, (2x-3)⁴= 625

c. (x-2)⁵=(x-2)⁷

d. 5^x+2 + 5^x+3 =750

tìm x biết: |x(x-4)| = x

8. tìm x biết:

\(\left|x-2019\right|^{20}+\left|x-2020\right|^{21}=1\)

7. Cho \(\left|a\right|< 1\), \(\left|a-c\right|< 1999\), \(\left|b-1\right|< 1999\).

CMR: \(\left|ab-c\right|< 3998\)

6. Cho \(\left|a-c\right|< 3\), \(\left|b-c\right|< 2\) .

CMR: \(\left|a-b\right|< 5\)