Question

Cum se rezolva aceste ecuatii de pe fotografie?

Answer 1

1)

x=2,17•(-5,21)=-11,3057

$2)x = 4 \frac{3}{11} \times ( - \frac{22}{71}) = \frac{4 \times 11 + 3}{11} \times \frac{ - 22}{71} = \frac{44 + 3}{11} \times \frac{ - 22}{71} = \frac{47}{11} \times \frac{ - 22}{71} = \frac{47 \times - 22}{11 \times 71} = \frac{ - 1034}{781} = - \frac{1034}{781} = - \frac{94}{71} = - 1 \frac{23}{71} \\ \\ 3)x = - 3 \frac{7}{18} \times ( - 4 \frac{2}{61}) = - \frac{3 \times 18 + 7}{18} \times - 4 \frac{2}{61} = - \frac{54 + 7}{18} \times - 4 \frac{2}{61} = - \frac{61}{18} \times - 4 \frac{2}{61} = - \frac{61}{18} \times \frac{ - (4 \times 61 + 2)}{61} = - \frac{61}{18} \times \frac{ - (244 + 2)}{61} = - \frac{61}{18} \times \frac{ - 246}{61} = - \frac{61 \times - 246}{18 \times 61} = - \frac{ - 15006}{1098} = - ( - \frac{15006}{1098}) = - ( - \frac{41}{3}) = \frac{41}{3} = 13 \frac{2}{3}$