1)-4+x=12 2)8-y=25,1 3)-12,1+x=-3,1 4)-7⋅x=49 5) y⋅8=-3,2 6)-1/3⋅x=6/7 1) (5 1/4 - 6 1/6)⋅(3 1/4 -0,55)= 2) 4/7⋅(-5 5/6) - 5/62⋅(-4 3/7) = 3) (2 1/3 -1 2/3⋅0,75):(-4 1/3)+1/8=

Уравнения

1. -4 + x = 12

   x = 12 + 4

   x = 16

2. 8 - y = 25.1

   -y = 25.1 - 8

   -y = 17.1

   y = -17.1

3. -12.1 + x = -3.1

   x = -3.1 + 12.1

   x = 9

4. -7 * x = 49

   x = 49 / -7

   x = -7

5. y * 8 = -3.2

   y = -3.2 / 8

   y = -0.4

6. -\[\frac{1}{3}\] * x = \frac{6}{7}

   x = \frac{6}{7} / -\frac{1}{3}

   x = \frac{6}{7} * -3

   x = -\frac{18}{7}

   x = -2 \frac{4}{7}

Выражения

1. (5 \(\frac{1}{4}\) - 6 \(\frac{1}{6}\)) * (3 \(\frac{1}{4}\) - 0.55) =

   (\[\frac{21}{4}\] - \[\frac{37}{6}\]) * (\[\frac{13}{4}\] - \[\frac{55}{100}\]) =

   (\[\frac{63}{12}\] - \[\frac{74}{12}\]) * (\[\frac{325}{100}\] - \[\frac{55}{100}\]) =

   -\[\frac{11}{12}\] * \[\frac{270}{100}\] = -\[\frac{11}{12}\] * \[\frac{27}{10}\] = -\[\frac{297}{120}\] = -\[\frac{99}{40}\]

   = -2 \(\frac{19}{40}\)

2. \(\frac{4}{7}\) * (-5 \(\frac{5}{6}\)) - \(\frac{5}{62}\) * (-4 \(\frac{3}{7}\)) =

   \(\frac{4}{7}\) * (-\[\frac{35}{6}\]) - \(\frac{5}{62}\) * (-\[\frac{31}{7}\]) =

   -\frac{140}{42} + \frac{155}{434} = -\frac{10}{3} + \frac{155}{434} = -\frac{10}{3} + \frac{5}{14} = -\frac{140}{42} + \frac{15}{42} = -\frac{125}{42}

   = -2 \(\frac{41}{42}\)

3. (2 \(\frac{1}{3}\) - 1 \(\frac{2}{3}\) * 0.75) : (-4 \(\frac{1}{3}\)) + \(\frac{1}{8}\) =

   (\(\frac{7}{3}\) - \(\frac{5}{3}\) * \(\frac{3}{4}\)) : (-\(\frac{13}{3}\)) + \(\frac{1}{8}\) =

   (\(\frac{7}{3}\) - \(\frac{15}{12}\)) : (-\(\frac{13}{3}\)) + \(\frac{1}{8}\) =

   (\(\frac{28}{12}\) - \(\frac{15}{12}\)) : (-\(\frac{13}{3}\)) + \(\frac{1}{8}\) =

   \(\frac{13}{12}\) : (-\(\frac{13}{3}\)) + \(\frac{1}{8}\) =

   \(\frac{13}{12}\) * (-\(\frac{3}{13}\)) + \(\frac{1}{8}\) =

   -\(\frac{39}{156}\) + \(\frac{1}{8}\) =

   -\(\frac{1}{4}\) + \(\frac{1}{8}\) = -\(\frac{2}{8}\) + \(\frac{1}{8}\) = -\(\frac{1}{8}\)

   = -\(\frac{1}{8}\)

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