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

Toán Lớp 7: (-1/2)^2 .V16/25 + V81 . (-2/3)^2 – 1 1/2 . V49

Toán Lớp 7: (-1/2)^2 .V16/25 + V81 . (-2/3)^2 – 1 1/2 . V49

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    (-1/2)^2. \sqrt{16/25} + \sqrt{81}. (-2/3)^2 – 1 1/2. \sqrt{49}
    =1/4. 4/5+9. 4/9-3/2. 7
    =1/5+4-21/2
    =21/5-21/2
    =-63/10

  2. (-1/2)^2 . $\sqrt{\dfrac{16}{25}}$ +$\sqrt{81}$ . (-2/3)^2 – 1 1/2 . $\sqrt{49}$
     = 1/4 . 4/5 + 9 . 4/9 – 3/2 . 7
    = 1/5 +4 – 21/2
    = 2/10 + 40/10 – 105/10
    = ( 2 + 40 – 105)/10
    =-63/10
    #caty09

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