Question

Vă rog ajutai-mă urgent dau coroana

Answer 1

Răspuns:

$a)5(2x - 1) = 7x + 1 \\ \\ 10x - 5 = 7x + 1 \\ \\ 3x = 3 \\ \\ x = 1 \\ \\ b)3(7 - 3x) = 5 - 5x \\ \\ 21 - 9x = 5 - 5x \\ \\ 16 = 4x \\ \\ x = 4 \\ \\ c)7(5 - 2x) = 8 - 5x \\ \\ 35 - 14x = 8 - 5x \\ \\ 35 - 8 = 14x - 5 \\ \\ 27 = 9x \\ \\ x = 3 \\ \\ d)4(3x + 4) - 1 = 7x \\ \\ 12x + 16 - 1 = 7x \\ \\ 12x - 7x = - 15 \\ \\ 5x = - 15 \\ \\ x = - 3 \\ \\ e)13x - 1 = 6(3x + 5) \\ \\ 13x - 1 = 18x + 30 \\ \\ - 31 = 18x - 13x \\ \\ - 31 = 5x \\ \\ x = - 31 \div 5 \\ \\ f)5 - 15x = 8(5 - 3x) \\ \\ 5 - 15x = 40 - 24x \\ \\ 24x - 15x = 40 - 5 \\ \\ 9x = 35 \\ \\ x = 35 \div 9$