Реши уравнения: 1) -2,3b = 11\(\frac{1}{2}\); 2) -4,42 : b = \(\frac{1}{5}\); 3) b : \(\frac{3}{4}\) = -12.

Решение

1. -2,3b = 11\(\frac{1}{2}\)

   -2,3b = \(\frac{23}{2}\)

   b = \(\frac{23}{2}\) : (-2,3)

   b = \(\frac{23}{2}\) : (-\(\frac{23}{10}\))

   b = \(\frac{23}{2}\) \(\cdot\) (- \(\frac{10}{23}\))

   b = -5

2. -4,42 : b = \(\frac{1}{5}\)

   b = -4,42 : \(\frac{1}{5}\)

   b = -4,42 \(\cdot\) 5

   b = -22,1

3. b : \(\frac{3}{4}\) = -12

   b = -12 \(\cdot\) \(\frac{3}{4}\)

   b = -9