Question

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fie a,b,c,apartine lui R,c diferit de 3,astfel incat a+b+2c=4 si 3a-2b+c=7.Aratati ca:a]11a-4b+7c=29 b]a+c=3 c]a-b=2 d]5a+12b+8c supra17a-3b+2c-12=3 supra4.

Answer 1

a+b+2c=4  a=3,b=1 si c=0
3+1+2x0=4
3x3-2x1+0=7
11a -4b+7c=29
11x3-4x1+7x0=29
a+c=3
3+0=3
a-b=2
3-1=2
5a+12b+8c/17a-3b+2c-12=3/4
5x3+12x1+8x0/17x3-3x1+2x0-12=3/4
15+12/51-3-12=3/4
27/