Question

Решите пожалуйста 845 номер со всеми решениями!!!

Answer 1

а) 0.51+0.8*(1.25+20+6)=0.51+0.8*27.25=0.51+21.8=22.31

Answer 2

#849

А)
$a {}^{3} + b {}^{3} \\ 3 {}^{3} + 0.2 {}^{3} = 27 + 0.008 = 27.008$
Б)
$(a + b) {}^{3} \\ (3 + 0.2) {}^{3} = 3.2 {}^{3} = 32.768$
В)
$(a + b)( {a}^{2} - ab + {b}^{2} ) \\ a {}^{3} + b {}^{3} \\ 3 {}^{3} + 0.2 {}^{3} = 27 + 0.008 = 27.008$
Г)
$a {}^{3} + 3 {a}^{2} b + 3ab {}^{2} + b {}^{3} \\ (a + b) {}^{3} \\ (3 + 0.2) {}^{3} = 3.2 {}^{3} = 32.768$