if x is positive, is x >3
1. (x-1)^2 >4
2. (x-2)^2 >9
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If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400