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

Toán Lớp 5: _5/8 m2 + 3/8 m2 x 2 = -..m2 _7/5 ha – 1/2 ha = -..dam2 _2/7 m2 : 2 + 6 m2 = -.m2

Toán Lớp 5: _5/8 m2 + 3/8 m2 x 2 = ……m2
_7/5 ha – 1/2 ha = ……dam2
_2/7 m2 : 2 + 6 m2 = …..m2

Comments ( 2 )

  1. 1.  ( 5/8 m2 + 3/8 m2 ) * 2 
         = 1 m2 * 2 = 2 m2
    2. 7/5 ha – 1/2 ha 
         = 21/10 ha
        21/10 ha = 9 dam2
    3. 2/7 m2 : 2+6 m2 
        = 2/7 m2 : 8/1 m2
        = 2/56 m2 = 1/ 28 m2

  2. (5/8 m^{2} + 3/8 m^{2}) xx 2
    = (5/8 + 3/8) m^{2} xx 2
    = 1 m^{2} xx 2
    = 2 m^{2}
    $\Rightarrow$ $\text{Điền 2}$
    _________________________
    7/5 ha – 1/2 ha
    = (7/5 – 1/2) ha
    = (14/10 – 5/10) ha
    = 9/10 ha
    = 9 dam^{2}
    $\Rightarrow$ $\text{Điền 9}$
    _____________________________
    2/7 m^{2} : 2 + 6 m^{2}
    = 2/7 m^{2} . 1/2 + 6 m^{2}
    = 1/7 m^{2} + 6 m^{2}
    = 43/7 m^{2}
    $\Rightarrow$ $\text{Điền}$ 43/7
     

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