7_klass_obsheobraz_matematika_iv_chetvert_sor_9_i_variant

7 klass matematika zadaniya sor-9 i variant 1. reshite sistemu lineynix uravneniy:(5 ballov) { 2𝑥 + 5𝑦 = 11 3𝑥 − 2𝑦 = 4 2. 58 uchashixsya otpravilis v puteshestvie na 10 lodkax. odna chast lodok – 4- mestnie, a drugaya – 7-mestnie. skolko 4-mestnix i skolko 7-mestnix lodok, esli vse mesta v lodkax zanyati? (5 ballov) 3. perimetr pryamougolnika raven 60 cm. esli odnu storonu uvelichit v 2 raza, a vtoruyu storonu umenshit na 6 cm, to perimetr obrazovannogo pryamougolnika budet raven 72 cm. naydite storoni dannogo pryamougolnika. (5 ballov) 4. visota, opushennaya na osnovanie ostrougolnogo treugolnika, obrazuet s bokovimi storonami ugli 32° i 46°. naydite ugli treugolnika. (5 ballov) 5. narisuyte s pomoshyu transportira ugol 76°. postroyte pri …

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