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

Toán Lớp 6: Mng giúp mik vs tìm x thỏa mãn a(-5).(-5).55<0 b (-2020).2021.(x+2022)=0

Toán Lớp 6: Mng giúp mik vs tìm x thỏa mãn a(-5).(-5).55<0 b (-2020).2021.(x+2022)=0

Comments ( 1 )

  1. Trả lời:
    a,(x-5).(x-5).55<0
    =>(x-5)^2.55<0
    (x-5)^2≥0∀x
    55>0∀x
    =>(x-5)^2.55>0
    =>(x-5).(x-5).55<0(Vô lý)
    $\text{Vậy}$ x in ∅
    b,(-2020).2021.(x+2022)=0
    =>[(-2020).2021].(x+2022)=0(-2020).2021 \ne 0)
    =>x+2022=0
    =>x=0-2022
    =>x=-2022
    $\text{Vậy}$ x=-2022

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

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