A40 B10 C40 D454在的展开式中的系数为 ( )5223 xxx A160 B240 C360 D800 5.(x+y+... nb0+b1x+b2x2+bnxn且 b0+b1+b2+bn62,则自然数 n .8的展开式中的系数是_ 44321111...
A40 B10 C40 D454在的展开式中的系数为 ( )A160 B240 C360 D8005.(x+y+z)9中含x4... nb0+b1x+b2x2+bnxn且b0+b1+b2+bn62,则自然数n .8的展开式中的系数是_9、若,则= ....
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