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

Toán Lớp 7: Tính √64=? √100=? √25 phần 81=?

Toán Lớp 7: Tính √64=?
√100=?
√25 phần 81=?

Comments ( 2 )

  1. $ \sqrt[]{64} = \sqrt[]{8^2} = | 8 |=  8 $
    $ \sqrt[]{100} = \sqrt[]{10^2} = |10|  = 10 $
    $ \sqrt[]{\dfrac{25}{81}} = \dfrac{\sqrt[]{25}}{\sqrt[]{81}} =\dfrac{\sqrt[]{5^2}}{\sqrt[]{9^2}} = \dfrac{|5|}{|9|} = \dfrac{5}{9} $
     

  2. $\sqrt[]{64}$ = $\sqrt[]{8^{2}}$  = |8| = 8
    $\sqrt[]{100}$ = $\sqrt[]{10^{2}}$  = |10| = 10
    $\sqrt[]{\frac{25}{81}}$ = $\sqrt[]{\frac{5^{2}}{9^{2}}}$ = |$\frac{5}{9}$| = $\frac{5}{9}$
    chúc bn hc tốt cho m ctlhn vs

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