(puc-sp) Certa mercadoria que custava r$ 12,50 teve um aumento, passando a custar r$14,50.A taxa de reajuste sobre o preço antig
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So, this question is basically asking us "If we had an x instead of a 2, would this be true?" We can try and see what we get:
So, if we want to show this we have to change the numerator or denominator in such a way that we can cancel some common factors. Notice that
If we replace the factored numerator with the original one, we get:
Since we have an equality, this relation is proved.
