Contents
A cikin wannan ɗaba'ar, za mu yi la'akari da menene ma'anar lissafin lambobi (biyu, uku, huɗu, da dai sauransu), za mu ba da wata dabara da za a iya samun ta da ita, sannan kuma za mu yi nazarin misalan matsalolin don ƙarin fahimtar juna. ka'idar abu.
Ma'anar da dabara
Talakawan lambobi biyu ko fiye shine rabon jimillarsu da adadinsu. Lissafi kamar haka:
- a1, a2..., an-1 и an - lambobi (ko sharuddan);
- n shine adadin duk sharuddan.
Musamman lokuta na dabara:
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lura: Yawanci ana amfani da harafin Helenanci don nuna ma'anar lissafi. μ (karanta as "mu").
Misalan ayyuka
Aiki 1
Petya yana da apples 4, Dasha yana da 6, kuma Lena yana da 5. Sun yanke shawarar hada dukkan 'ya'yan itatuwa tare da raba su daidai tsakanin kowannensu. Yi lissafin adadin apples kowanne zai samu.
Magani
A wannan yanayin, muna da lambobi uku, kuma muna buƙatar nemo ma'anar lissafin su. Don yin wannan, yi amfani da dabarar da ke sama:
amsa: kowanne yana samun apples 5.
Aiki 2
Dan wasan ya shafe sa'o'i 5 yana rufe nisa daga maki A zuwa maki B, yayin da saurinsa ya kasance kamar haka: sa'o'i biyu na farko - 6 km / h, sannan sa'o'i biyu - 9 km / h, mintuna 60 na ƙarshe - 7 km / h. Nemo matsakaicin saurin ku.
Magani
Don haka, muna buƙatar ƙididdige matsakaicin ƙididdiga na lambobi biyar waɗanda suka dace da saurin gudu na kowace sa'a na gudu:
amsa: Matsakaicin gudun dan wasa shine 7,4 km/h.