Zredukuj wyrazy podobne i oblicz wartości podanych sum algebraicznych :
a) 2a-4b+3b+3a-5b-a+1 dla : a= 1/3 i b= (-3)
b)n2+n-7+3n2-n-9-n+16 dla : n= (-1/2)
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a) 2a-4b+3b+3a-5b-a+1 dla : a= 1/3 i b= (-3)
2a-4b+3b+3a-5b-a+1=4a-6b+1
4*1/3-6*(-3)+1=4/3+18+1=1 1/3+19=20 1/3
b)n2+n-7+3n2-n-9-n+16 dla : n= (-1/2)
n2+n-7+3n2-n-9-n+16= 4n^2-n
4*(-1/2)^2-(-1/2)=4*1/4+1/2=1+1/2=1 1/2