197. Решите уравнение: 1)-8x = 72; 2) 0,9x = -5,4; 3) -1,7x = -5,1; 4): x = 5)-x= 6)-3/x=

1) -8x = 72

x = 72 : (-8)

x = -9

2) 0,9x = -5,4

x = -5,4 : 0,9

x = -6

3) -1,7x = -5,1

x = -5,1 : (-1,7)

x = 3

4) \(\frac{9}{4}\) : x = \(\frac{8}{27}\)

x = \(\frac{9}{4}\) : \(\frac{8}{27}\)

x = \(\frac{9}{4}\) ⋅ \(\frac{27}{8}\)

x = \(\frac{243}{32}\)

x = 7\(\frac{19}{32}\)

5) -\(\frac{7}{6}\)x = -\(\frac{1}{6}\)

x = -\(\frac{1}{6}\) : (-\(\frac{7}{6}\))

x = -\(\frac{1}{6}\) ⋅ (-\(\frac{6}{7}\))

x = \(\frac{1}{7}\)

x = \(\frac{1}{7}\)

6) -3\(\frac{4}{7}\)x = \(\frac{25}{28}\)

-\(\frac{25}{7}\)x = \(\frac{25}{28}\)

x = \(\frac{25}{28}\) : (-\(\frac{25}{7}\))

x = \(\frac{25}{28}\) ⋅ (-\(\frac{7}{25}\))

x = -\(\frac{1}{4}\)

x = -\(\frac{1}{4}\)