2^x=300 怎么求x (lg2=0.3010 lg3=0.4771)

问题描述:

2^x=300 怎么求x (lg2=0.3010 lg3=0.4771)

两边取2为底数的对数;
x=log2(300)= (lg300)/lg2=(lg3+lg100)/lg2=(lg3+2)/lg2=8.2296;