Question

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Номер 896(1)
2 не надо

Answer 1

1)

(7x - 42)/4 = (5x + 5)/3 - 3x - 6  ( теперь умножаем на 12)

3(7x - 42) = 4*(5x + 5) - 12*3x - 12*6

21x - 126 = 20x + 20 - 36x - 72

21x - 126 = -16x - 52

21x + 16x = 126 - 52

37x = 74

x = 74 : 37

x = 2


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2)

(3x - 24)/5 + (7x + 35)/6 = (28x + 6)/15 + 1/3  (умножим на 30)

6*(3x - 24) + 5*(7x + 35) = 2*(28x + 6) + 30*1/3

18x - 144 + 35x + 175 = 56x + 12 + 10

53x + 31 = 56x + 22

56x - 53x = 31 - 22

3x = 9

x = 9:2

x = 3

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3)

(6x + 15)/8 - (10x + 14)/3 = (7x - 105)/4 - 55/8  (умнож. на 24)

3*(6x + 15) - 8*(10x + 14) = 6*(7x - 105) - 24*55/8

18x + 45 - 80x - 112 = 42x - 630 - 165

-62x - 67 = 42x - 795

42x + 62x = 795 - 67

104x = 728

x = 728 : 104

x = 7