Question

срочно пожалуйста составьте плиииз!​

Answer 1

$a) \: {2.1}^{2} - 1.4 = \\ ( { \frac{21}{10} }^{2} ) - \frac{7}{5} = \\ \frac{441}{100} - \frac{7}{5} = \\ \frac{441 - 140}{100} = \\ \frac{301}{100} = 3 \frac{1}{100} = 3.01$

$b) \: 20 \times (64.3 - 59.8) = \\ 20 \times 4.5 = 90$