Решите 5 уравнений: 1) 7a = - 310 + 3a 2) 25 - 3b = 9 - 5b 3) 3(4x- 8) = 3x - 6 4) 12 - 2(x+ 3) = 26 5) - 5(0, 8 x - 1, 2) = - x + 7,2

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Решите 5 уравнений: 1) 7a = - 310 + 3a 2) 25 - 3b = 9 - 5b 3) 3(4x- 8) = 3x - 6 4) 12 - 2(x+ 3) = 26 5) - 5(0, 8 x - 1, 2) = - x + 7,2

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Accepted Answer

1) 7a = - 310 + 3a 4a=-310 a=-77.5 2) 25 - 3b = 9 - 5b 2b=9-25 2b=-16 b=-8 3) 3(4x- 8) = 3x-6 12x-24=3x-6 9x=18 x=2 4) 12 - 2(x+ 3) = 26 12-2x-6=26 2x=12-6-26 2x=-20 x=-10 5) - 5(0, 8 x - 1, 2) = - x + 7,2 -4x+6=-x+7.2 3x=-1.2 x=-0.4