{"id":1285,"date":"2025-12-22T12:59:28","date_gmt":"2025-12-22T11:59:28","guid":{"rendered":"http:\/\/mymatma.pl\/?p=1285"},"modified":"2025-12-22T12:59:33","modified_gmt":"2025-12-22T11:59:33","slug":"zadanie-117","status":"publish","type":"post","link":"https:\/\/mymatma.pl\/?p=1285","title":{"rendered":"Zadanie 117"},"content":{"rendered":"\n<p><strong>zadanie 28 \u2013 sierpie\u0144 2010 ( zadanie otwarte) (2pkt)<\/strong><\/p>\n\n\n\n<p>Pi\u0105ty wyraz ci\u0105gu arytmetycznego jest r\u00f3wny 26 , a suma pi\u0119ciu pocz\u0105tkowych wyraz\u00f3w tego ci\u0105gu jest r\u00f3wna 70 . Oblicz pierwszy wyraz tego ci\u0105gu.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n    <div class=\"premium-wrapper-odp\" id=\"odp_69e22b0c52902\">\n        <button class=\"premium-btn-odp\"\n                data-id=\"odp_69e22b0c52902\"\n                style=\"margin-top:10px; padding:12px 20px; background:#28a745; color:#fff; border-radius:25px; border:none; cursor:pointer; font-weight:bold;\">\n            Poka\u017c odpowied\u017a\n        <\/button>\n\n        <div class=\"premium-content-odp\" style=\"display:none; padding:15px; border:1px solid #28a745; margin-top:10px; background:#e6ffe6; border-radius:25px;\">\n            \nPrawid\u0142owa odpowied\u017a to a\u2081 = 10.\n        <\/div>\n    <\/div>\n    \n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n    <div class=\"premium-wrapper-wyjasnienie\" id=\"wyjasnienie_69e22b0c5290d\">\n        <button class=\"premium-btn-wyjasnienie\"\n                data-id=\"wyjasnienie_69e22b0c5290d\"\n                style=\"margin-top:10px; padding:12px 20px; background:#28a745; color:#fff; border-radius:25px; border:none; cursor:pointer; font-weight:bold;\">\n            Poka\u017c wyja\u015bnienie\n        <\/button>\n\n        <div class=\"premium-content-wyjasnienie\" style=\"display:none; padding:15px; border:1px solid #28a745; margin-top:10px; background:#e6ffe6; border-radius:25px;\">\n            \n<h3>Wyja\u015bnienie<\/h3>\n\n<p>W zadaniu podano dwie informacje o ci\u0105gu arytmetycznym:<\/p>\n\n<ul>\n  <li>a<sub>5<\/sub> = 26<\/li>\n  <li>S<sub>5<\/sub> = 70<\/li>\n<\/ul>\n\n<p>Korzystamy ze wzoru na sum\u0119 n pocz\u0105tkowych wyraz\u00f3w ci\u0105gu arytmetycznego:<\/p>\n\n<p style=\"text-align:center;\">\nS<sub>n<\/sub> = (a<sub>1<\/sub> + a<sub>n<\/sub>) \u00b7 n \/ 2\n<\/p>\n\n<p>Podstawiamy dane dla n = 5:<\/p>\n\n<p style=\"text-align:center;\">\n70 = (a<sub>1<\/sub> + 26) \u00b7 5 \/ 2\n<\/p>\n\n<p>Mno\u017cymy obie strony przez 2:<\/p>\n\n<p style=\"text-align:center;\">\n140 = 5(a<sub>1<\/sub> + 26)\n<\/p>\n\n<p>Dzielimy przez 5:<\/p>\n\n<p style=\"text-align:center;\">\n28 = a<sub>1<\/sub> + 26\n<\/p>\n\n<p>Odejmujemy 26 od obu stron:<\/p>\n\n<p style=\"text-align:center; font-size: 1.2em;\">\n<strong>a<sub>1<\/sub> = 2<\/strong>\n<\/p>\n\n<h3>Odpowied\u017a:<\/h3>\n<p>Pierwszy wyraz ci\u0105gu wynosi <strong>2<\/strong>.<\/p>\n\n        <\/div>\n    <\/div>\n    \n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>zadanie 28 \u2013 sierpie\u0144 2010 ( zadanie otwarte) (2pkt) Pi\u0105ty wyraz ci\u0105gu arytmetycznego jest r\u00f3wny 26 , a suma pi\u0119ciu pocz\u0105tkowych wyraz\u00f3w tego ci\u0105gu jest r\u00f3wna 70 . Oblicz pierwszy wyraz tego ci\u0105gu.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"_uag_custom_page_level_css":"","_themeisle_gutenberg_block_has_review":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[25,80,195,81,83],"tags":[23,79,131],"class_list":["post-1285","post","type-post","status-publish","format-standard","hentry","category-ciag-arytmetyczny","category-sierpien-2010","category-suma-poczatkowych-wyrazow-ciagu-ciag-arytmetyczny","category-zadania-maturalne","category-zadania-tematami","tag-ciag-arytmetyczny","tag-sierpien-2010","tag-suma-poczatkowych-wyrazow-ciagu"],"jetpack_featured_media_url":"","uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"kubio-fullhd":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false},"uagb_author_info":{"display_name":"adminmymatma","author_link":"https:\/\/mymatma.pl\/?author=1"},"uagb_comment_info":0,"uagb_excerpt":"zadanie 28 \u2013 sierpie\u0144 2010 ( zadanie otwarte) (2pkt) Pi\u0105ty wyraz ci\u0105gu arytmetycznego jest r\u00f3wny 26 , a suma pi\u0119ciu pocz\u0105tkowych wyraz\u00f3w tego ci\u0105gu jest r\u00f3wna 70 . Oblicz pierwszy wyraz tego ci\u0105gu.","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/posts\/1285","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mymatma.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1285"}],"version-history":[{"count":1,"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/posts\/1285\/revisions"}],"predecessor-version":[{"id":1286,"href":"https:\/\/mymatma.pl\/index.php?rest_route=\/wp\/v2\/posts\/1285\/revisions\/1286"}],"wp:attachment":[{"href":"https:\/\/mymatma.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1285"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mymatma.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1285"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mymatma.pl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}