10、已知8.62=73.96,若x2=0.7396,则x的值等于( ) A 86.2 B 862 C ±0.862 D ±862
问题描述:
10、已知8.62=73.96,若x2=0.7396,则x的值等于( ) A 86.2 B 862 C ±0.862 D ±862
答
选C
8.6^2=73.96
x^2=0.7396
x=土0.86^是社么意思?再详细些行吗?^是次方的意思,我想楼主题目打错了吧原题目应该是8.6的平方,也就是8.6^2x^2=0.7396=73.96×0.01x=√(73.96×0.01)=8.6×0.1=0.86√是根号的意思