√(9-4√2)怎么化简
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√(9-4√2)怎么化简
√(9-4√2)怎么化简
√(9-4√2)怎么化简
√(9-4√2)
=√(1-4√2+8)
=√[(1-2√2)^2]
=1-2√2或2√2-1
(9-4√2)=9-2√8=(√8-1)^2
所以原式=√8-1=2√2-1
√(8-4√2+1)
=√(2√2-1)^2
=2√2-1
2√2 -1
√(9-4√2)怎么化简
√(9-4√2)怎么化简
√(9-4√2)怎么化简
√(9-4√2)
=√(1-4√2+8)
=√[(1-2√2)^2]
=1-2√2或2√2-1
(9-4√2)=9-2√8=(√8-1)^2
所以原式=√8-1=2√2-1
√(8-4√2+1)
=√(2√2-1)^2
=2√2-1
2√2 -1