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x²+x²=x²
x²=x²
Odp. Nie
b) (2a)²+a²=(√3a²)²
2a²+a²=3a²
3a²=3a²
Odp. Tak
c) (4x)²+(√2x²)²=(√18x²)²
16x²+2x²=18x²
18x²=18x²
Odp.Tak
d) (2a)²+(3a)²=(√13a²)²
4a²+9a²=13a²
13a²=13a²
Odp. Tak