问题
填空题
若4.6242=21.38,则-462.42=______;又若x2=0.213 8,则x=______.
答案
∵4.6242=21.38,
∴-462.42=-213800,
∵x2=0.2138,
∴x=±0.4624,
故答案为:-213800,±0.4624.
若4.6242=21.38,则-462.42=______;又若x2=0.213 8,则x=______.
∵4.6242=21.38,
∴-462.42=-213800,
∵x2=0.2138,
∴x=±0.4624,
故答案为:-213800,±0.4624.