oblicz wartość liczbową wyrażenia:
a) 4x-(x+6)+4 dla x= 1/3
b) (x²+1)-(x²-2)+10 dla x=2.2
c) (a+4b)-(5+2a)-(3b-5) dla a= -0.1 i b= 0.2
d) (-a²+2ab-1)+(a²-4ab+5) dla a= ¼ i b= 2
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