lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7

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lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7
x)ըx6Q

lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7
lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7

lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7
lim(x→∞)[(2x-1)^3 * (3x^2+2)^2]/x^7
=lim(x→∞)[(2x-1)^3 /x^3* (3x^2+2)^2/x^4]
=lim(x→∞)[(2-1/x)^3 * (3+2/x^2)^2]
=2^3*3^2
=72

只看最高次项系数比即可,因此极限是72

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