Ответы и объяснения

2013-04-24T14:50:43+00:00
2013-04-24T14:59:12+00:00

(x+1)^2+(x+3)^2<=2x^2

x^2+2x+1+x^2+6x+9<=2x^2

2x^2+8x+10x<=2x^2

2x^2+8x+10x-2x^2<=0

18x<=0

x<=0