Question

Calcule: a)2+x=5 b)x/2 = 80 c)0,5 - x = 0,1 d)2x/5+1=1

Answer 1

Resposta:

Explicação passo-a-passo:

Answer 2

Resposta:

$2 + x = 5 \\ x = 5 - 2 \\ x = 3 \\ \\ \frac{x}{2} = 80 \\ x = 80 \times 2 \\ x = 160 \\ \\ 0.5 - x = 0.1 \\ \frac{5}{10} - x = \frac{1}{10} \\ \frac{1}{2} - x = \frac{1}{10} \\ - x = \frac{1}{10} - \frac{1}{2} \\ mmc \: de \: 2 \: e \: 10 = 10 \\ - x = \frac{1}{10} - \frac{5}{10} \\ - x = \frac{1 - 5}{10} \\ - x = - \frac{4}{10} \times ( - 1) \\ x = \frac{4 \div 2}{10 \div 2} \\ x = \frac{2}{5} ou \: x =0.4 \\ \\ \frac{2x}{5} + 1 = 1 \\ \frac{2x}{5} = 1 - 1 \\ \frac{2x}{5} = 0 \\ 2x =0 \times 5 \\ 2x = 0 \\ x = \frac{0}{2} \\ x = 0 \\ ou \\ \frac{2x}{5 + 1} = 1 \\ \frac{2x}{6} = 1 \\ 2x = 1 \times 6 \\ 2x = 6 \\ x = \frac{6}{2} \\ x = 3$