2) fatore as expressoes (agrupamento)
a) ac x bc + ad + bd
b) 3ax+ay + 3bx+by
c) 3ay-3a+by-b
d) 5am+ay+5bm +by
e) 8x-3xy+8-3y
PFV RESPONDA
Respostas
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a) ac+bc+ad+bd = c(a+b) + d(a+b)
= (a+b).(c+d)
b) 3ax+ay+3bx+by = a(3x+y) +b(3x+y)
= (3x+y).(a+b)
c) 3ay-3a+by-b = 3a(y-1) +b(y-1)
= (y-1).(3a+b)
d) 5am+ay+5bm+by = a(5m+y) + b(5m+y)
= (5m+y).(a+b)
e) 8x-3xy+8-3y =
8x+8-3xy-3y = 8(x+1) -3y(x+1)
= (x+1).(8-3y)
= (a+b).(c+d)
b) 3ax+ay+3bx+by = a(3x+y) +b(3x+y)
= (3x+y).(a+b)
c) 3ay-3a+by-b = 3a(y-1) +b(y-1)
= (y-1).(3a+b)
d) 5am+ay+5bm+by = a(5m+y) + b(5m+y)
= (5m+y).(a+b)
e) 8x-3xy+8-3y =
8x+8-3xy-3y = 8(x+1) -3y(x+1)
= (x+1).(8-3y)
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