Question

15-simplifique as expressões
(ab\2)3 .(ab2\3)-2

16- qual a forma mais simples de se escrever estas expressões?
a) 2a-1.b-1
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b-1+2a =

b) x.y-2(x-1.y)2.(x.y-1)3
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x2.y.x.y-1.x-1.y-2 =

Answer 1

15. (ab\2)3= ab^3/8
      (ab2\3)-2= (1/ab^2 / 1/3)^2=(1/ab^2)/ (1/9)

16- a) 2a-1.b-1 = 2ab-2a-b+1
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b-1+2a = b-1+2a

b) x.y-2(x-1.y)2.(x.y-1)3= (x.y-2x+1.-2y).(2x.2y-1)^3=
(-x.-y+1).(2x.2y-1)=(xy+1).(4xy-1)=4xy^2-xy+4xy-1= 4xy^2+3xy-1
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x2.y.x.y-1.x-1.y-2 = (x^3y).(y-1)=x^3y^2-x^3y= y.(x-1)=(xy-y).(y-2)= xy^2-2xy-y^2-2y