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

Toán Lớp 6: Tìm số nguyên x, biết; (x² –10)(x² –20)<0

Toán Lớp 6: Tìm số nguyên x, biết; (x² –10)(x² –20)<0

Comments ( 1 )

  1. Vì (x^2-10)(x^2-20)<0
    =>(x^2-10), (x^2-20) khác dấu
    =>10<x^2<20
    =>x=4
    x=-4
    Đs: x=(4,-4)

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

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