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W(x)=3x+30+(x-2)=3x+30+x-2=4x+28
Odp. D
2.
14/√7 * √7/√7=14√7/7= 2√7
3.
4 elementy (liczby)
4.
5*81*10⁷⁰=405*10⁷⁰
Odp. 5