January 2019 1 27 Report
W której z dziedzin jest błąd:
1.√(x²+y²)²-(x²-y²)²=2xy ,xy≥0
2.√x²+2xy+y²=x+y ,x+y≥0
3.√x²-2xy*y²=x-y ,x≥y
4.√x²-2x+1=x-1 , x≥0
x²+2x+1=x+1 ,

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