tính hợp lí
\(\frac{8^{10}+4^{10}}{8^4+4^{11}}\)

task1; fill in the blanks

 imagination, batteries, creativity, invented, idea

Imagine your life without electricity. before electricity, we didn't have useful things such as (1)______, computers and mobile phones.

Inventors need (2)_____ and (3)_____. Before the rubber, people used bread to rub out writing! In 1839 Charles Goodyear had an (4)______. He (5)_____ the modern rubber.