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

Toán Lớp 9: rút gọn <9 x ( √6 - 4) >/ ( √6 + 1)x( √6 – 2)

Toán Lớp 9: rút gọn <9 x ( √6 - 4) >/ ( √6 + 1)x( √6 – 2)

Comments ( 2 )

  1. ~rai~
    \(\dfrac{9(\sqrt{6}-4)}{(\sqrt{6}+1)(\sqrt{6}-2)}\\=\dfrac{9(\sqrt{6}-4)}{6-2\sqrt{6}+\sqrt{6}-2}\\=\dfrac{9(\sqrt{6}-4)}{4-\sqrt{6}}\\=\dfrac{-9(4-\sqrt{6})}{4-\sqrt{6}}\\=-9.\)

  2. \qquad(9(\sqrt{6}-4))/((\sqrt{6}+1)(\sqrt{6}-2))
    =(9(sqrt{6}-4))/(6-2sqrt{6}+sqrt{6}-2)
    =(-9(4-sqrt{6}))/(4-sqrt{6})
    =-9
     

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