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

Toán Lớp 6: c) x ⋮ 12 và 24 < x < 67 d) 5mũ x .3 – 75 = 0

Toán Lớp 6: c) x ⋮ 12 và 24 < x < 67 d) 5mũ x .3 – 75 = 0

Comments ( 2 )

  1. x chia hết cho 12 thì x ∈ B ( 12 )
    b)
    $5^x . 3 – 75 = 0$
    $5^x . 3 = 0 + 75$
    $5^x . 3=  75$
    $5^x    = 75 : 3$
    $5^x    = 25$
    $⇒ x = 2$

  2. $c)x\vdots12$     $24<x<67$
    x∈{36;48;60}
    $d)5^x.3-75=0$
    $->5^x.3=75$
    $->5^x=25$
    $->5^x=5^2$
    $->x=2$
    Vậy x=2
    Chúc bạn học tốt !!!!!!

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

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