Question

determine as raízes das seguintes equações ​

Answer 1

Resposta:

a) $2x+6=x+18\\2x-x=18-6\\x=12$      b) $2x-2=5x+18\\2x-5x=18+2\\(-3x=20).(-1)\\3x=-20\\x=\frac{-20}{3}\\x\approx-6,6$     c) $\frac{x}{4}-1=5\\\frac{x}{4}=5+1\\x=6.4\\x=24$    d) $x+2=\frac{2x}{3}-3\\2+3=\frac{2x}{3}+x\\5.3=3x\\\frac{15}{3}=x\\5=x$

e) $4x-2(x-1)=3\\4x-2x+2=3\\2x=3-2\\2x=1\\x=\frac{1}{2}\\x=0,5$    f) $2-\frac{x}{2}=\frac{x+2}{2}\\2=\frac{x+2}{2}+\frac{x}{2}\\2=\frac{2x+2}{2}\\2.2=2x+2\\4-2=2x\\\frac{2}{2}=x\\1=x$