Do wyrazenia 2x(3y-z+3x) dodaj trzykrotnosc wyrazeniax(-2x - z - 2y) a nastepnie
oblicz wartość liczbową su,y tych wyrazen dla x=1/5 z= - \/4
\/ -pierwiastek
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2x(3y-z+3x) + 3(-2x-z-2y) =
= 6xy - 2xz +6x2 -6x - 3z -6y =
= (6 x 1/5 x y) + [6 x (1/5)2] - (6 x 1/5) - (3 x -2) - 6y =
= 6/5y + 6/25 - 6/5 - 6 - 6y =
= -18/25 - 6 - 18/30y =
= -260/25 - 2/5y =
= -10 2/5 - 2/5y