Question

alguém ajuda por favor ​

Answer 1

Resposta:

Explicação passo a passo: Marcelo comprou a televisão apresentada a seguir com a condição de pagar o preço à vista sem acrescer acréscimos dando uma entrega no valor de 395 e 80 centavo e o restante após 30 dias quantos reais Marcelo deveria pagar a loja 30 dias após a comprar televisão preço à vista 826 55

Answer 2

Resposta:

$Grupo\ 1:\\a:\ x=7\\b:\ x=1,67\\c:\ x=5\\d:\ x=2\\e:\ x=-2\\f:\ x=-7\\\\Grupo\ 2:\\a:\ x=-0,25\\b:\ x=-20\\c:\ x=5\\d:\ x=91\\e:\ x=73,1\\f:\ x=79$

Explicação passo a passo:

$2 -\\\\Grupo\ 1:\\\\a)\ 5x+1=36\\5x=36-1\\5x=35\\x=\frac{35}{5}\\x=7\\\\b)\ 7x=4x+5\\7x-4x=5\\3x=5\\x=\frac{5}{3}\\x=1,67\\\\c)\ 9x-7=5x+13\\9x-5x=13+7\\4x=20\\x=\frac{20}{4}\\x=5\\\\d)\ 15x-13=-39-11x\\ 15x+11x=39+13\\26x=52\\x=\frac{52}{26}\\x=2\\\\e)\ 21+9x=15x+33\\9x-15x=33-21\\-6x=12\\-x=\frac{12}{6}\\-x=2\\x=-2\\\\f)\ 16-11x+12=-15x\\-11x+15x=-16-12\\4x=-28\\x=-\frac{28}{4}\\x=-7$

$Grupo\ 2:\\\\a)\ 2\bullet(2x-1)-6\bullet(1-2x)=2\bullet(4x-5)\\4x-2-6+12x=8x-10\\4x+12x-8x=-10+2+6\\8x=-2\\x=-\frac{2}{8}\\x=-0,25\\\\b)\ 2x+3\bullet(x-2)=7x+34\\2x+3x-6=7x+34\\2x+3x-7x=34+6\\-2x=40\\-x=\frac{40}{2}\\-x=20\\x=-20\\\\c)\ 4\bullet(x-2)=4+2\bullet(x-1)\\4x-8=4+2x-2\\4x-2x=4-2+8\\2x=10\\x=\frac{10}{2}\\x=5\\\\d)\ 10\bullet(100-x)+2x=3\bullet(x+9)-28\\1.000-10x+2x=3x+27-28\\-10x+2x-3x=27-28-1.000\\-11x=-1001\\-x=-\frac{1001}{11}\\-x=-91\\x=91$

$e)\ 5\bullet(x+60)-400,7=8\bullet(x-40)\\5x+300-400,7=8x-320\\5x-8x=-320+400,7-300\\-3x=-219,3\\-x=-\frac{219,3}{3}\\-x=-73,1\\x=73,1\\\\f)\ 7\bullet(2x-50)-4x=10\bullte(51,9-0,1x)\\14x-350-4x=519-x\\14x-4x+x=519+350\\11x=869\\x=\frac{869}{11}\\x=79$