(1/5x+1/2z) . (1/5x - 1/2z) por favor respondam
(1/5x+1/2z).(1/5-1/2z) cortamos o 1/2z e -1/2z
(1/5x).(1/5x) agora regra de 3
5x=5x
x= 5
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(1/5x+1/2z).(1/5-1/2z) cortamos o 1/2z e -1/2z
(1/5x).(1/5x) agora regra de 3
5x=5x
x= 5