rozwiązaniem równania x= - 1 jest liczba
pier2*x=pier2-1 /:pier2
x=(pier2-1)/pier2
x=pier2*(pier2-1)/pier2*pier2
x=(2-pier2)/2
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pier2*x=pier2-1 /:pier2
x=(pier2-1)/pier2
x=pier2*(pier2-1)/pier2*pier2
x=(2-pier2)/2