Respostas

2014-03-16T13:36:23-03:00
A=3x+6=33
A=x+6=33/3
A=x=11-6
A=x=4
A={4}
B=-b+ou-√Δ/2.a
B=(a=2 ; b=-9 ; c=4)
Δ=-9²-4.2.4
Δ=81-32
Δ=√49
Δ=7
-(-9)+ou-7/2.2
x'=9+7/4=16/4=4
x''=9-7/4=0,5 ou 1/2
B={4,1/2}
C={4,5,6,7}

AuB={3,1/2}
A∩B={4}
A-B={ }
Au(B
∩c)={1/2.4,5,6,7}
B
∩C={4}





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