1-Indique o que representam as expressoes:

a) a^2
b)b^2
c)2ab
d)(a+b)^2

2- Efetue e simplifique.

a)x^2-(x+10)^2
b)(3x+5)^2-9x^2
c)(2x-1)^2+x(3x-2)
d)(1+x)(1-x)-(1+x)^2
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