分析:由對數(shù)函數(shù)y=log0.3x單調(diào)遞減的性質(zhì)可得a<0;由冪函數(shù)y=x0.3單調(diào)遞增的性質(zhì)可得0<b<c<1;由對數(shù)函數(shù)y=log3x單調(diào)遞增的性質(zhì)可得d>log33=1;由此可得答案.
解答:解:由對數(shù)函數(shù)y=log0.3x單調(diào)遞減的性質(zhì)可得a<0;
由冪函數(shù)y=x0.3單調(diào)遞增的性質(zhì)可得0<b<c<10.3=1;
由對數(shù)函數(shù)y=log3x單調(diào)遞增的性質(zhì)可得d>log33=1;
故a、b、c、d的大小關(guān)系為:a<b<c<d,
故答案為:a<b<c<d
點評:本題考查函數(shù)值大小的比較,涉及對數(shù)函數(shù)和冪函數(shù)的單調(diào)性,屬基礎題.