几道二次根式的题目!1.2√2-4√1/27+3√482.(√3-√2)(-√3-√2)3.已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值已知m为实数,化简:-√-m^3 - m√-1/m
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![几道二次根式的题目!1.2√2-4√1/27+3√482.(√3-√2)(-√3-√2)3.已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值已知m为实数,化简:-√-m^3 - m√-1/m](/uploads/image/z/8821627-43-7.jpg?t=%E5%87%A0%E9%81%93%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%E7%9A%84%E9%A2%98%E7%9B%AE%211.2%E2%88%9A2-4%E2%88%9A1%2F27%2B3%E2%88%9A482.%28%E2%88%9A3-%E2%88%9A2%29%28-%E2%88%9A3-%E2%88%9A2%293.%E5%B7%B2%E7%9F%A5a%3D2%2B%E2%88%9A5%2Cb%3D2-%E2%88%9A5%2C%E6%B1%82%E2%88%9Aa%5E2-ab%2Bb%5E2%E7%9A%84%E5%80%BC%E5%B7%B2%E7%9F%A5m%E4%B8%BA%E5%AE%9E%E6%95%B0%2C%E5%8C%96%E7%AE%80%EF%BC%9A-%E2%88%9A-m%5E3+-+m%E2%88%9A-1%2Fm)
几道二次根式的题目!1.2√2-4√1/27+3√482.(√3-√2)(-√3-√2)3.已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值已知m为实数,化简:-√-m^3 - m√-1/m
几道二次根式的题目!
1.2√2-4√1/27+3√48
2.(√3-√2)(-√3-√2)
3.已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值
已知m为实数,化简:-√-m^3 - m√-1/m
几道二次根式的题目!1.2√2-4√1/27+3√482.(√3-√2)(-√3-√2)3.已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值已知m为实数,化简:-√-m^3 - m√-1/m
1.2√2-4√1/27+3√48=2√2-4√3/9+12√3=2√2+104√3/9
2.(√3-√2)(-√3-√2)=(-√2)²-(√3)²=2-3=-1
3.已知a=2+√5,b=2-√5,
√a^2-ab+b^2=√(9+4√5)-(4-5)+(9-4√5)=√19
1. 2√2-4√1/27+3√48=2√2-4√3/3+12√3=2√2+32√3/3
2. (√3-√2)(-√3-√2)
=2-3=-1
3. 已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值
√a^2-ab+b^2=√[4+4√5+5+1+4-4√5+5]=√19求补充问题答案-√-m^3 - m√-1/m...
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1. 2√2-4√1/27+3√48=2√2-4√3/3+12√3=2√2+32√3/3
2. (√3-√2)(-√3-√2)
=2-3=-1
3. 已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值
√a^2-ab+b^2=√[4+4√5+5+1+4-4√5+5]=√19
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1. 2√2-4√1/27+3√48
=2√2-4/9√3+12√3
=2√2-(104√3)/9
2. (√3-√2)(-√3-√2)
=-3+2
=-1
3. 已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值
√a^2-ab+b^2<...
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1. 2√2-4√1/27+3√48
=2√2-4/9√3+12√3
=2√2-(104√3)/9
2. (√3-√2)(-√3-√2)
=-3+2
=-1
3. 已知a=2+√5,b=2-√5,求√a^2-ab+b^2的值
√a^2-ab+b^2
=√(a²-2ab+b²+ab)
=√[(a-b)²+ab]
=√[(2+√5-2+√5)²+(2+√5)(2-√5)]
=√(5+4-5)
=√4
=2
已知m为实数,化简:-√-m^3 - m√-1/m
-√-m^3 - m√-1/m
=-√(-m)³-m√(-1/m)
=-(-m)√m-m/(-m)√m
=m√m-√m
=(m-1)√m
楼上错了两题
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