Observe as igualdade: 1)(a-b):(a-b)=b²-2ba+a² 2)(x²+y)²=y²+x(elevado a 4)+2yx² 3)x²-y²=(y+x).(y-x) 4)(m+n)²-2mn=n²+m²? É correto afirmar que:  a)1 é falsa 
b)1,2 e 3 são verdadeiras 
c)1,2 e 4 são verdadeiras 
d)2 e 3 são falsas
                                 (Com Cálculo)!..
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