Matemática, perguntado por fernandavitori29, 10 meses atrás

me ajudem a) -3(x – 5) -2(2x + 1) = -8 b)4+x=7 c)2x-8=3x-10 d)6(3x+21-8=-2 e)2x+8=20 f)5x-4=6x+8 g)x+-4=17-2x+1

Soluções para a tarefa

Respondido por guassassin8
0

A)-3(x-5)-2(2x+1)=-8\\-3x+15-4x-2=-8\\-7x+13=-8\\-7x=-21\\-x=-3\\x=3\\

B)4+x=7\\x=3

C) 2x-8=3x-10\\-x-8=-10\\-x=-10+8\\-x=-2\\x=2

D) 6(3x+21-8)=-2\\6(3x+13)=-2\\18x+78=-2\\18x=-80\\x=\frac{-80}{18}\\\\x=\frac{-40}{9}

E)2x+8=20\\2x=12\\x=6

F) 5x-4=6x+8\\-4-8=6x-5x\\-12=x

G)x-4=17-2x+1\\x-4=18-2x\\x+2x=18+4\\3x=22\\x=\frac{22}{3}

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