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

Toán Lớp 8: rút gọn biểu thức (2018²-2020²):(2019²-2021²) bằng

Toán Lớp 8: rút gọn biểu thức (2018²-2020²):(2019²-2021²) bằng

Comments ( 1 )

  1. (2018^2-2020^2):(2019^2-2021^2)
    =(2018-2020)(2018+2020):(2019-2021)(2019+2021)
    =-2(2018+2020).(1)/(-2(2019+2021))
    =(2018+2020)/(2019+2021)
    =(2019-1+2019+1)/(2020-1+2020+1)
    =(2019+2019)/(2020+2020)
    =(2019.2)/(2020.2)
    =(2019)/(2020)
     

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

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