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se dau numerele a=20,b+c=10,x+y=7.calculati:ab+ac,ax+ay,a+2b+2c

Răspuns :

Duliamadalin200
1)b+c=10->b=10-c
               ->c=10-b
20x(10-c)+20x(10-b)=200-20c+200-20b
2)20x(7-y)+20x(7-x)=140-20y+140-20x
3)20+2x(10-c)+2(10-b)=20+20-2c+20-2b

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