Nā nīnau hoʻohālike e kūkākūkā ana i ka wehewehe ʻana o nā palena hana
Pengantar
I ka calculus, he mea koʻikoʻi a he mea nui ke kumumanaʻo o nā palena. ʻO ka hoʻomaopopo ʻana i ka palena o kahi hana he mea nui ia i ka nānā ʻana i kona ʻano i kona hoʻokokoke ʻana i kahi kiko. Ma kēia ʻatikala, e kūkākūkā mākou i ka wehewehe ʻana o ka palena o kahi hana me nā kikoʻī, me kekahi mau pilikia hoʻohālike a me kā lākou mau hoʻonā. ʻO ka pahuhopu ka hāʻawi ʻana i kahi ʻike hohonu o ke kumumanaʻo o ka palena o kahi hana.
Ka Wehewehena o ka Palena Hana
Ma ke ʻano naʻauao, ʻo ka palena o kahi hana \( L \) o \( f(x) \) i ka wā e hoʻokokoke aku ai ʻo \( x \) iā \( a \) ʻo ia ka waiwai a \( f(x) \) e hoʻokokoke aku ai i ka wā e kokoke aku ai ʻo \( x \) iā \( a \). ʻO kona wehewehe kūhelu ma ka hōʻailona makemakika penei:
\[
\lim_{{x \to a}} f(x) = L
\]
ʻO ke ʻano kēia no kēlā me kēia \(\epsilon > 0\), aia ka \(\delta > 0\) i hiki ai inā \(0 < |x - a| < \delta\), a laila \( |f(x) - L| < \epsilon \). I nā huaʻōlelo ʻē aʻe, hiki ke hoʻokokoke ʻia ʻo \( f(x) \) i \( L \) ma ka hoʻokokoke ʻana iā \( x \) i \( a \), akā ʻaʻole like me \( a \).
Nā Nīnau Hoʻohālike a me ke Kūkākūkā I mea e maʻalahi ai ka hoʻomaopopo ʻana i ke kumumanaʻo o nā palena hana, e nānā kākou i kekahi mau nīnau hoʻohālike a me kā lākou kūkākūkā ʻana. Nīnau Hoʻohālike 1: E huli \(\lim_{{x \to 2}} (3x + 4)\). Kūkākūkā: No ka loaʻa ʻana o kēia palena, hiki iā mākou ke pani pololei \( x \) me 2 ma ka hana \( f(x) = 3x + 4 \): \[ f(2) = 3 \cdot 2 + 4 = 6 + 4 = 10 \] No laila, \(\lim_{{x \to 2}} (3x + 4) = 10\). Nīnau Hoʻohālike 2: E helu \(\lim_{{x \to 0}} \frac{\sin x}{x}\). Kūkākūkā: ʻO kēia palena kekahi o nā palena kumu i ka calculus a hoʻohana pinepine ʻia ma ke ʻano he theorem. ʻO ka hoʻohana ʻana i kahi calculator a i ʻole nā ʻano helu ʻaʻole paha e hāʻawi i nā hopena pololei loa no ka mea kokoke ka waiwai i ka hoʻokahi. No ka hōʻoia ʻana i kēia palena ma ke ʻano loiloi, hiki iā mākou ke hoʻohana i ka theorem palena trigonometric. ʻO ka theorem i koi ʻia ʻo ia ka \(\lim_{{x \to 0}} \frac{\sin x}{x} = 1\), no laila: \[ \lim_{{x \to 0}} \frac{\sin x}{x} = 1 \] Laʻana Pilikia 3 Pilikia: Loiloi \(\lim_{{x \to 3}} \frac{x^2 - 9}{x - 3}\). Kūkākūkā: Ma ke ʻano pololei, inā e hoʻokomo mākou i \( x = 3 \), e loaʻa iā mākou kahi ʻano pau ʻole, ʻo ia hoʻi \(\frac{0}{0}\). No laila, pono mākou e hoʻohālikelike mua i ka hana e hoʻomaʻalahi i ka pilikia. ʻO ka mea mua, hoʻohui mākou i ka helu: \[ x^2 - 9 = (x - 3)(x + 3) \] A laila hoʻololi mākou i ka palena: \[ \lim_{{x \to 3}} \frac{(x - 3)(x + 3)}{x - 3} \] Ma ka hoʻopau ʻana i ka denominator maʻamau (ʻoiai \( x \neq 3 \)): \[ \lim_{{x \to 3}} (x + 3) = 3 + 3 = 6 \] No laila, \(\lim_{{x \to 3}} \frac{x^2 - 9}{x - 3} = 6\). Laʻana Pilikia 4 Pilikia: E huli \(\lim_{{x \to \infty}} \frac{2x^3 - x^2 + 3}{5x^3 + x - 2}\). Hoʻonā: No ka palena i ka wā e hoʻokokoke aku ai ʻo \(x\) i ka palena ʻole, hiki iā mākou ke kālele i ka huaʻōlelo me ka mana kiʻekiʻe loa ma ka numerator a me ka denominator. I kēia hihia, ʻo ka mana kiʻekiʻe loa ʻo \(x^3\). No laila, hiki ke hoʻomaʻalahi ʻia ka palena ma luna i: \[ \lim_{{x \to \infty}} \frac{2x^3 - x^2 + 3}{5x^3 + x - 2} \approx \lim_{{x \to \infty}} \frac{2x^3}{5x^3} = \frac{2}{5} \] No laila, \(\lim_{{x \to \infty}} \frac{2x^3 - x^2 + 3}{5x^3 + x - 2} = \frac{2}{5}\). Ke Manaʻo o nā Palena ma ke Ao Maoli a me kā lākou Hoʻohana ʻO ka hoʻomaopopo ʻana i nā palena he mea nui loa ia ma nā ʻano like ʻole o ka makemakika a me ka ʻepekema. Ma ke ao maoli, hiki ke hoʻohana ʻia nā palena e hoʻohālike a wānana i nā hanana e loli mau nei. Ke helu mākou i ka derivative (ka wikiwiki o ka loli), he kuleana koʻikoʻi nā palena i ka hoʻoholo ʻana i ke ʻano o kahi hana a puni kahi kiko, no ka laʻana, ka wikiwiki koke i ka physics. Hopena: Ma o ke kūkākūkā ʻana ma luna, ua maopopo iā mākou ka wehewehe ʻana o ka palena o kahi hana a me kekahi mau pilikia hoʻohālike e hōʻike ana i kēia manaʻo ma nā ʻano like ʻole. Mai nā loiloi palena maʻalahi a hiki i nā pilikia e pili ana i nā ʻano indeterminate, ʻo ke akamai i ka hana ʻana me nā palena hana he kumu nui ia no ka calculus a me ka loiloi makemakika holomua. Ma ka hoʻomaʻamaʻa ʻana i nā pilikia palena, hiki iā mākou ke hoʻomaikaʻi i kā mākou mau mākau loiloi i ka hoʻomaopopo ʻana i ke ʻano o nā hana paʻakikī.
