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9. Calculati termenul necunoscut:
a + 7 x 5 =9x9 a - 5 x 6 = 9 x 7
a + 4 x 4 = 8 x 7 a - 3 x 8 = 7 x 6
8 x 8-a - 6x6
9 x 8-a = 3 x 9​


Răspuns :

a + 7 × 5 = 9 × 9

a + 35 = 81

a = 81 - 35

a = 46

a + 4 × 4 = 8 × 7

a + 16 = 56

a = 56 - 16

a = 40

8 × 8 - a = 6 × 6

64 - a = 36

a = 64 - 36

a = 28

9 × 8 - a = 3 × 9

72 - a = 27

a = 72 - 27

a = 45

a - 5 × 6 = 9 × 7

a - 30 = 63

a = 63 + 30

a = 93

a - 3 × 8 = 7 × 6

a - 24 = 42

a = 42 + 24

a = 66