5 2/7+-(6.4) математика​

+ и - не могут быть вместе может 5 2/7+(-6,4)?

-1 4/35

Пошаговое объяснение:

-6.4 = 6 4/10

5 2/7+(-6 4/10) = 5 2/7-6 4/10 = 5*7+2/7-6*10+4/10 = 37/7-64/10 = 10*37/10*7-7/64/7/10 = 370/70-448/70 = 370-448/70 = - 78/70 = - 39*2/35*2 = - 39/35 = -1 4/35

Как то так)

21 = 7 * 3

18 = 2 * 3 * 3 = 2 * 3²

нок (21 и 18) = 7 * 2 * 3² = 14 * 9 = 126

24 = 3 * 2³

32 = 7 * 2²

нок (24 и 32) = 3 * 7 * 2³ = 21 * 8 = 168

16 = 2⁴

20 = 5 * 2²

нок (16 и 20) = 2⁴ * 5 = 16 * 5 = 80

20 = 5 * 2²

35 = 5 * 7

нок (20 и 35) = 5 * 7 * 2² = 35 * 4 = 140

75 = 3 * 5²

90 = 2 * 3 * 3 * 5 = 2 * 5 * 3²

нок (75 и 90) = 5² * 3² * 2 = 25 * 9 * 2 = 450

6 = 2 * 3

13 = 13 * 1

нок (6 и 13) = 6 * 13 = 78

14 = 2 * 7

18 = 2 * 2 * 3 = 2² * 3

нок (14 и 18) = 2² * 7 * 3 = 4 * 21 = 84

28 = 7 * 2²

42 = 7 * 2 * 3

нок (28 и 42) = 7 * 2² * 3 = 21 * 4 = 84

21 = 7 * 3

33 = 3 * 11

нок (21 и 33) = 7 * 3 * 11 = 7 * 33 = 231

12 = 2 * 2 * 3 = 2² * 3

30 = 2 * 3 * 5

75 = 3 * 5²

нок (12, 30 и 75) = 2² * 3 * 5² = 4 * 3 * 25 = 12 * 25 = 300

15 = 3 * 5

42 = 7 * 2 * 3

105 = 3 * 5 * 7

нок (15, 42 и 105) = 3 * 5 * 2 * 7 = 210

21 = 3 * 7

28 = 2² * 7

35  = 5 * 7

нок (21,28 и 42) = 7 * 3 * 5 * 2² = 420

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