知道 10^2.8=X ;10^5.6=Y
則題目問你log(X^2+Y)等於問你log(10^5.6+10^5.6)=log(2*10^5.6)=log2+log10^5.6=0.3010+5.6=5.9010
5.若正實數 x, y 滿足 log10x = 2.8,log10y = 5.6..-阿摩線上測驗