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7.A当0x<[文];1时，[x]=0[章],则f(x)=当1[来]≤x<2时，[自][x]=1,则f([知]x)=x一2豪3时[嘛]，[x]=2,则f[答](x)=x一[x][案]=当3≤x<[网]4时，[x]=3,[文]则f(x)=x一[[章]x]=x-3.易见[来]该函数具有周期性，[自]绘制函数f(x)的[知]图象，如图所示，-[嘛]3-2-1所以f([答]x)在R上的值域为[案][0,1)，所以f[网](x)在[0,2][文]上的值域也为[0,[章]1).故选A
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