√(0.000456)=√[456X10^(-3)]=10^(-1) X √456=0.1 X √456 = 0.07696 故√456 =0.7696 满意请及时采纳 补充： √(0.000456)=√[456X10^(-6)]=10^(-2) X √456=0.01 X√456 = 0.07696 故√456 =7.696满意请采纳...
