若化简的话等于2√2若算术的话等于2.828427125.....为无限不循环小数很高兴为你解答，满意请采纳
根号8等于2根号2
根号8等于=±2根号2=±2.8284271247
根号8=2倍根号2约等于2.828
√8=2√2=2.8284271247461900976033774484194......
