lim(x→∞)(3x³-4x²+2)/(7x³+5x²-3)=lim(x→∞)[3-(4/x)+(2/x³)]/[7+(5/x)-(3/x³)]=3/7
lim(x→∞)(3x^3-4x^2+2)/(7x^3+5x^2-3)=
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