September 2018 1 13 Report

doprowadź do najprostszej postaci

1 (2+a)²+(2-a)²-2²-a²

2 (2x+4)²-4x²-16

3 9x²-25+(3x-5)(3x+5)-2x

4 (7-y)²+(y+7)²+1


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