Respostas
Resposta:
1 + 1/3 x
---------- = ---------
2 - 2/3 x - 1/5 multiplique cruzado
(1 + 1/3) . (x - 1/5) = x (2 - 2/3)
1 . x + 1 . -1/5 + 1/3 . x +1/3 . -1/5 = x . 2 + x . -2/3
\/ \/ \/ \ / \ / \ /
x -1/5 +x/3 -1/15 = 2x -2x/3
x + x/3 -2x +2x/3 = +1/5 +1/15 mmc = 15
15 . x +5x - 30x + 10x 3 + 1
------------------------------- = -------- descarte o mmc
15 15
15 . x +5x - 30x + 10x = 3 + 1
\ / \ / \ /
15x -25x +10x = 4
\ /
-10x +10x = 4
\ /
x = 4 ................ 3a. resposta
Explicação passo a passo: