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ljubsik
@ljubsik
July 2022
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4 карандаша и 3 тетради стоят 34 руб., а 2 карандаша и 2 тетради стоят 20 руб. Сколько стоят 8 карандашей и 7 тетрадей?
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Anast1sia
К-карандаш Т-тетрадь
4к+3т=34
2к+2т=20
2*(к+т)=20 :(2)
к+т=10
к=10-т
4*(10-т)+3т=34
40-4т+3т=34
-т=34-40
-т=-6 (:-1)
т=6 руб
к=10-6=4руб
8к*4руб+7т*6руб=32руб+42руб=74руб
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Answers & Comments
4к+3т=34
2к+2т=20
2*(к+т)=20 :(2)
к+т=10
к=10-т
4*(10-т)+3т=34
40-4т+3т=34
-т=34-40
-т=-6 (:-1)
т=6 руб
к=10-6=4руб
8к*4руб+7т*6руб=32руб+42руб=74руб