Question

Tính hợp lí:

\(55.2^2.5+4.89.5^2-3^2.10^3\)

Answer 1

=5².2².11+2².5².89-9.10³

=5².2²(11+89)-9.10³

=(5.2)².100-9.10³

=10².10^2_9.10³

=10³(10-9)

=10³=1000

Answer 2

\(55.2^2.5+4.89.5^2-3.10^3\)

\(=55.4.5+4.89.25-9.1000\)

\(=220.5+356.25-9000\)

\(=1100+8900-9000\)

\(=10000-9000\)

\(=1000\)

Answer 3

55 . 2² . 5 + 4 . 89 . 5² - 3² . 10³

= 5 . 11 . 4 . 5 + 4 . 89 . 5 . 5 - 9 . 1000

= 100 . 11 + 89 . 100 - 9000

= 100 . ( 11 + 89 ) - 9000

= 100 . 100 - 9000

= 10000 - 9000

= 1000