Question

Decat pct.D dinexercitiul dat

Answer 1

c)  

5 a + 3 b + 99 = 158

5 a + 3 b = 158 - 99

5 a + 3 b = 59

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10 a + 6 b + 34 + 78 = 230

10 a + 6 b + 112 = 230

2 ( 5 a + 3 b ) = 230 - 112

5 a + 3 b = 118 : 2

5 a + 3 b = 59

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Verificare rezultat →  corect

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d)

3 a + 5 b = 26

4 a + 3 b = 20

______________ → adun relatiile

7 a + 8 b = 46  → date de intrare

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7 a + 8 b = 35 → date de iesire

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Verificare rezultat: → incorect / rezultatul corect era 46

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e )

a + 2 b = 25

2 a + 3 b = 40

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3 a + 5 b = 65 → date de intrare

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5 a + 9 b + 7 = 122 → date de iesire

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( 2 a - a ) + ( 3 b - 2 b ) = 40 - 25

a + b = 15

2 × ( 3 a + 5 b ) - ( a + b ) = 2 × 65 - 15

 6 a + 10 b - a - b =  130 - 15

5 a + 9 b = 115 → verificare rezultat:   corect