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Cele 2 ex!!
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Cele 2 Ex Le Vreau Cu Operații Fara Răspunsuri Directe class=

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Exercitiul 1

a × 3 = 27

a = 27 : 3

a = 9

9 × a = 63

a = 63 : 9

a = 7

a × 8 = 48

a = 48 : 8

a = 6

7 × a = 42

a = 42 : 7

a = 6

5 × a = 50

a = 50 : 5

a = 10

8 × a = 8

a = 8 : 8

a = 1

(3 + 4) × a = 56

7 × a = 56

a = 56 : 7

a = 8

a × (25 - 17) = 72

a × 8 = 72

a = 72 : 8

a = 9

(100 - 91) × a = 36

9 × a = 36

a = 36 : 9

a = 4

a × (4 + 5) = 45

a × 9 = 45

a = 45 : 9

a = 5

(1000 - 992) × a = 48

8 × a = 48

a = 48 : 8

a = 6

a × (10 - 10) = 0

a × 0 = 0

a ∈ R

a × 5 × 5 = 25

a × 25 = 25

a = 25 : 25

a = 1

2 × 4 × a = 40

8 × a = 40

a = 40 : 8

a = 5

a × 2 × 3 = 24

a × 6 = 24

a = 24 : 6

a = 4

9 × 1 × a = 81

9 × a = 81

a = 81 : 9

a = 9

3 × a × 2 = 54

a × 6 = 54

a = 54 : 6

a = 9

a × a × 8 = 32

a² = 32 : 8

a² = 4

a ∈ {-2, 2}

Exercitiul 2

a - (6 × 7) = 48

a - 42 = 48

a = 48 + 42

a = 90

(8 × 7) - a = 20

56 - a = 20

a = 56 - 20

a = 36

a + (8 : 1) = 24

a + 8 = 24

a = 24 - 8

a = 16

(7 : 7) + a = 21

1 + a = 21

a = 21 - 1

a = 20

a - (10 : 10) = 99

a - 1 = 99

a = 99 + 1

a = 100

1219 - a = 948

a = 1219 - 948

a = 271

a - 4914 = 1748

a = 1748 + 4914

a = 6662

1219 - a = 999

a = 1219 - 999

a = 20

(6 × 6) ÷ a = 4

36 : a = 4

a = 36 : 4

a = 9

a : (4 : 1) = 7

a : 4 = 7

a = 7 × 4

a = 28

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