0.4的0.8次方=0.4^0.8=(0.4^0.4)×(0.4^0.4)0.8的0.4次方=(0.4×2)^0.4=(0.4^0.4)×(2^0.4)因为：(0.4^0.4)×(0.4^0.4)&lt(0.4^0.4)×(2^0.