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

Toán Lớp 6: tính giá trị biểu thức A=2020a/b – 2021b/a

Toán Lớp 6: tính giá trị biểu thức A=2020a/b – 2021b/a

Comments ( 2 )

  1. A=(2020a)/b – (2021b)/a
    =(2020a.a)/(a.b) – (2021b.b)/(a.b)
    =(2020a^2 – 2021b^2)/(a.b)

  2. Giải đáp:
     $\dfrac{2020a}{b}-\dfrac{2021b}{a}$
    $= \dfrac{2020a.a}{a.b}-\dfrac{2021b.b}{a.b}$
    $= \dfrac{2020a²}{ab}-\dfrac{2021b²}{ab}$
    $= \dfrac{2020a²-2021b²}{ab}$
     

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

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