已知log3,7=a,log2,3=b,求log2,7的值.
问题描述:
已知log3,7=a,log2,3=b,求log2,7的值.
RT
答
log3,7=lg7/lg3=a log2,3=lg3/lg2=b log2,7=lg7/lg2=lg7/lg3*lg3/lg2=ab
已知log3,7=a,log2,3=b,求log2,7的值.
RT
log3,7=lg7/lg3=a log2,3=lg3/lg2=b log2,7=lg7/lg2=lg7/lg3*lg3/lg2=ab