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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Rút gọn căn thức: 3* $\sqrt[]{\frac{129}{16}+\sqrt[]{2} }$

Toán Lớp 9: Rút gọn căn thức: 3* $\sqrt[]{\frac{129}{16}+\sqrt[]{2} }$

Comments ( 2 )

  1. y10000
    •3.\sqrt{\frac{129}{16}+\sqrt{2}}
    =3.\sqrt{\frac{129+16\sqrt{2}}{16}}
    =3.\sqrt{\frac{(8\sqrt{2})²+2.8\sqrt{2}.1+1²}{16}}
    =3.\sqrt{\frac{(8\sqrt{2}+1)²}{16}}
    =3.|\frac{8\sqrt{2}+1}{4}|
    =\frac{24\sqrt{2}+3}{4}

  2. #tnvt
    3.\sqrt{129/16+\sqrt{2}}
    =3.\sqrt{\frac{129+16\sqrt{2}}{16}}
    =3.\sqrt{\frac{128+2.8\sqrt{2}.1+1}{4^2}}
    =3.\sqrt{\frac{(8\sqrt{2}+1)^2}{4^2}}
    =3.|\frac{8\sqrt{2}+1}{4}|
    =3. \frac{8\sqrt{2}+1}{4}
    =\frac{24\sqrt{2}+3}{4}
     

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222-9+11+12:2*14+14 = ? ( )