Question

Tính thuận tiện câu C

Answer 1

a)19.86+19.124

=19(86+124)

=19.210

=3990

Answer 2

b)\(10^2-\left(7.6^2-19.2^3\right)\)

\(=100-\left(252-152\right)\)

\(=100-100\)

\(=0\)

Answer 3

c)\(442-\left(5^2.13-8^3:8\right)\)

\(=442-\left(25.13-8^2\right)\)

\(=442-\left(325-64\right)\)

\(=442-261\)

\(=181\)