【導(dǎo)讀】[解析]a·a2=a3,故A錯(cuò);3=a3b3,故B錯(cuò);a10÷a2=a8,故D錯(cuò),只有C正確.。[解析]∵a∈R,∴a2-a+1>0,=12+12+2+1-1=22.3-3-0+×(-12)-4;=52-1+116+18+110=14380.=32-1-94+49=-4736.∴x+x-1=x+1x=2-2=9-2=7.2)2=2=x+1x-2=7-2=5,-13+()-1-π0=________.=53+43+10-1=12.