1)-4+x=12 2)8-4=25,1 3)-12,1+x=-3,1 4)-70X=49 5) 4-8=-3,2 6)-x= 1) (5-6)(3/4-0,55)= 2)/(-50)-飯・(-4)= 3) (2-10.0,75):(-4)+=+=

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}

Выражения

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

   Первая скобка:

   5\\frac{1}{4} - 6\\frac{1}{6} = \\frac{21}{4} - \\frac{37}{6} = \\frac{21*3 - 37*2}{12} = \\frac{63 - 74}{12} = -\\frac{11}{12}

   Вторая скобка:

   3\\frac{1}{4} - 0.55 = 3.25 - 0.55 = 2.7

   - \\frac{11}{12} * 2.7 = -\\frac{11}{12} * \\frac{27}{10} = -\\frac{11 * 9}{4 * 10} = -\\frac{99}{40} = -2\\frac{19}{40}

   Ответ: -2\\frac{19}{40}

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

   \\frac{4}{7} * (-5\\frac{5}{6}) = \\frac{4}{7} * ( -\\frac{35}{6}) = -\\frac{2}{1} * \\frac{5}{3} = -\\frac{10}{3}

   -\\frac{5}{62} * (-4\\frac{3}{7}) = -\\frac{5}{62} * ( -\\frac{31}{7}) = \\frac{5}{2} * \\frac{1}{7} = \\frac{5}{14}

   - \\frac{10}{3} + \\frac{5}{14} = \\frac{-10 * 14 + 5 * 3}{42} = \\frac{-140 + 15}{42} = -\\frac{125}{42} = -2\\frac{41}{42}

   Ответ: -2\\frac{41}{42}

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

   1) 1\\frac{2}{3} * 0.75 = \\frac{5}{3} * \\frac{3}{4} = \\frac{5}{4} = 1\\frac{1}{4}

   2) 2\\frac{1}{3} - 1\\frac{1}{4} = \\frac{7}{3} - \\frac{5}{4} = \\frac{7*4 - 5*3}{12} = \\frac{28 - 15}{12} = \\frac{13}{12}

   3) \\frac{13}{12} : (-4\\frac{1}{3}) = \\frac{13}{12} : ( -\\frac{13}{3}) = \\frac{1}{4} * (-1) = -\\frac{1}{4}

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

   Ответ: -\\frac{1}{8}

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