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

Toán Lớp 7: Tìm x a,|x|-2,5=27,5 b,3/4+2/5*x=29/60 c, (x-1)^5=-32

Home/ Toán Lớp 7: Tìm x a,|x|-2,5=27,5 b,3/4+2/5*x=29/60 c, (x-1)^5=-32

Toán Lớp 7: Tìm x a,|x|-2,5=27,5 b,3/4+2/5*x=29/60 c, (x-1)^5=-32

Tháng Tư 3, 2023 Toán học 2 Comments 0 views

Toán Lớp 7: Tìm x
a,|x|-2,5=27,5
b,3/4+2/5*x=29/60
c, (x-1)^5=-32

Comments ( 2 )

  1. lanngocha
    lanngocha
    3 Tháng Tư, 2023 at 5:38 sáng
    Reply
    a) |x| – 2,5 = 27,5
    => |x| = 30
    => x = ±30.
    b) 3/4 + 2/5 . x = 29/60
    => 2/5 . x = -4/15
    => x = -2/3
    c) (x – 1)^5 = -32
    => (x – 1)^5 = (-2)^5
    => x – 1 = -2
    => x = -1.

  2. tonhitruc
    tonhitruc
    3 Tháng Tư, 2023 at 5:38 sáng
    Reply
    $\text{a, | x | – 2,5 = 27,5 }$
    $\text{⇔ | x | = 30 }$
    $\text{⇔ x = ± 30 }$
    $\text{b, $\dfrac{3}{4}$ +$\dfrac{2}{5}$ × x = $\dfrac{29}{60}$ }$
    $\text{⇔ $\dfrac{2}{5}$ × x = $\dfrac{-4}{15}$ }$
    $\text{⇔ x = $\dfrac{-2}{3}$}$
    $\text{c, $( x – 1 )^{5}$ = -32 }$
    $\text{⇔ $( x – 1 )^{5}$  = $-2^{5}$ }$
    $\text{⇔ x – 1 = – 2 }$
    $\text{⇔ x = -1 }$

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

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