根号下九减四倍根号二怎么算

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/18 21:08:40
根号下九减四倍根号二怎么算根号下九减四倍根号二怎么算根号下九减四倍根号二怎么算√(9-4√2)=√(8-2√8+1)=√(√8-1)²=√8-1=2√2-1√(9-4√2)=√(1-4√2+

根号下九减四倍根号二怎么算
根号下九减四倍根号二怎么算

根号下九减四倍根号二怎么算
√(9-4√2)
=√(8-2√8+1)
=√(√8-1)²
=√8-1
=2√2-1

√(9-4√2)
=√(1-4√2+8)
=√(2√2)²-2×1×2√2+1²)
=√(2√2-1)²
=2√2-1

√(9-4√2)=√(1-4√2+﹙2√2﹚²)=√(2√2-1)²=2√2-1