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Se stie ca a =11 si b+c=8 .Calculati : 10×a+9×b+9×c! 7×b+7×c+9×a! 11×b+a×c.

Răspuns :

[tex]a = 11[/tex]

[tex]b + c = 8[/tex]

[tex]10 a + 9b + 9c = 10a + 9(b + c)[/tex]

[tex] = 10 \times 11 + 9 \times 8[/tex]

[tex] = 110 + 72[/tex]

[tex] = 182[/tex]

[tex]7b + 7c + 9a = 7(b + c) + 9a[/tex]

[tex] = 7 \times 8 + 9 \times 11[/tex]

[tex] = 56 + 99[/tex]

[tex] = 155[/tex]

[tex]11b + ac = 11b + 11c = 11(b + c)[/tex]

[tex] = 11 \times 8 = 88[/tex]