1) 1/2a + 1/3a - 1/4a если a= 1 5/7 2) 4/7b + 5/21b - вопрос №8195598112131415724752123213 от dawdawad 26.03.2022 18:02

Question

Математика: 1) 1/2a + 1/3a - 1/4a если a= 1 5/7 2) 4/7b + 5/21b - 2/3b если b = 2 1/3 3) 1 5/12m + 2 7/18m - 1 2/9m если m=1 17/31 со всеми решениями

dawdawad · Answer

1) 1/2а + 1/3а - 1/4а = 6/12а + 4/12а - 3/12а = 7/12аесли а = 1 5/7 = 12/77/12 * 12/7 = 1
2) 4/7b + 5/21b - 2/3b = 12/21b + 5/21b - 14/21b = 3/21b = 1/7bесли b = 2 1/3 = 7/31/7 * 7/3 = 1/3
3) 1 5/12m + 2 7/18m - 1 2/9m = 1 15/36m + 2 14/36m - 1 8/36m = 2 21/36m = 2 7/12mесли m = 1 17/31 = 48/312 7/12m = 31/12 * 48/31 = 48/12 = 4