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