Question

mim ajudem! por favor​

Answer 1

¡Hey!!

Explicação passo-a-passo:

1)

$b) \: \: ( - 10) - ( - 11) + ( - 5) + 1 \\ = - 10 + 11 - 5 + 1 \\ = 1 - 5 + 1 \\ = - 4 + 1 \\ = - 3$

$c) \: \: ( + 20) - ( - 36) + ( - 1) + 3 \\ = 20 + 36 - 1 + 3 \\ = 56 - 1 + 3 \\ = 58$

$d) \: \: ( - \frac{1}{4} ) - ( + \frac{1}{2} ) \\ = - \frac{1}{4} - \frac{1}{2} \: \: \: \: \: \: \: \: = > mmc \\ = - \frac{1}{4} - \frac{1 \times 2}{2 \times 2} \\ = - \frac{1}{4} - \frac{2}{4} = \frac{ - 1 - 2}{4} = - \frac{ - 3}{4}$

$e) \: \: ( - \frac{1}{4} ) - ( - \frac{1}{3} ) + ( - \frac{1}{2} ) \\ = - \frac{1}{4} + \frac{1}{3} - \frac{1}{2} \: \: \: \: \: \: \: \: = > mmc \\ = - \frac{3}{12} + \frac{4}{12} - \frac{6}{12} \\ = \frac{1 - 6}{12} \\ = \frac{ - 5}{12}$

2)

$a) {x}^{3} - {y}^{2} \\ = ( - 2)^{ 3} - ({ - 3})^{2} \\ = - 8 - 9 \\ = - 17$

$b) {2a}^{2} - {b}^{3} \\ = 2.( { - 4})^{2} - ( { - 5})^{3} \\ = 2 \times 16 - ( - 125) \\ = 32 + 125 \\ = 157$