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

Toán Lớp 6: a. [ 124 – ( 20 – 4x)] : 30 +7 = 11 b. 72.5 – (2x+1) = 630 : 9 c. (10 – 4x) +120 : 23 =17 d. 30 . (x+2) – 2. ( x-5) -24 = 30 e. (3x+9)

Home/ Toán Lớp 6: a. [ 124 – ( 20 – 4x)] : 30 +7 = 11 b. 72.5 – (2x+1) = 630 : 9 c. (10 – 4x) +120 : 23 =17 d. 30 . (x+2) – 2. ( x-5) -24 = 30 e. (3x+9)

Toán Lớp 6: a. [ 124 – ( 20 – 4x)] : 30 +7 = 11 b. 72.5 – (2x+1) = 630 : 9 c. (10 – 4x) +120 : 23 =17 d. 30 . (x+2) – 2. ( x-5) -24 = 30 e. (3x+9)

Tháng Tư 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: a. [ 124 – ( 20 – 4x)] : 30 +7 = 11
b. 72.5 – (2x+1) = 630 : 9
c. (10 – 4x) +120 : 23 =17
d. 30 . (x+2) – 2. ( x-5) -24 = 30
e. (3x+9).(11 – x) =0
f. -3 . (x-2)3 = 81
Các bạn ơi, giúp mình với ! Cảm ơn m.n trước nhaaa =)

Comments ( 2 )

  1. khanhngantoan
    khanhngantoan
    4 Tháng Tư, 2022 at 1:00 chiều
    Reply
    $ a,[124−(20−4x)]:30+7=11 $
    $ [124−(20−4x)]:30=11−7 $
    $ [124−(20−4x)]:30=4 $
    $ 124−(20−4x)=4×30 $
    $ 124−(20−4x)=120 $
    $ 20−4x=124−120 $
    $ 20−4x=4 $
    $ 4x=20−4 $
    $ 4x=16 $
    $ x=16:4=4 $
    $ b, 72.5−(2x+1)=630:9 $
    $ 360−(2x+1)=70 $
    $ 2x+1=290 $
    $ 2x=289 $
    $ x=289 : 2=144,5 $
    $ c, (10−4x)+120:2^{3}=17 $
    $ (10−4x)+120:8=17 $
    $ (10−4x)+15=17 $
    $ 10−4x=2 $
    $ 4x=8 $
    $ x=2 $
    $ d, 30.(x+2)−2.(x−5)−24=30 $
    $ 30x+60−2x−10−24=30 $
    $ (30x−2x)+(60−10−24)=30 $
    $ 28x+26=30 $
    $ 28x=4 $
    $ x = 1/7 $

  2. mocmien87
    mocmien87
    4 Tháng Tư, 2022 at 12:59 chiều
    Reply
    Giải đáp:
    a, [ 124 – ( 20 – 4x)] : 30 +7 = 11
    -> [ 124 – ( 20 – 4x)] : 30 = 11 – 7
    -> [ 124 – ( 20 – 4x)] : 30 = 4
    -> 124 – ( 20 – 4x) = 4 xx 30
    -> 124 – ( 20 – 4x) = 120
    -> 20 – 4x = 124 – 120
    -> 20 – 4x =4
    -> 4x = 20 – 4
    -> 4x = 16
    -> x = 16 : 4
    -> x = 4
    Vậy x = 4
    ——————-
    b, 72.5 – (2x+1) = 630 : 9
    -> 360−(2x+1)=70
    -> 2x+1=290
    ->2x=289
    -> x=289/2
    -> x =144,5
    Vậy x = 144,5
    ——————-
    => Sửa đề:
    c, (10−4x)+120:2^³=17
    -> (10−4x)+120:8=17
    -> (10−4x)+15=17
    -> 10−4x=2
    -> 4x=8
    -> x=2
    Vậy x=2
    ——————-
    d, 30 . (x+2) – 2. ( x-5) -24 = 30
    -> 30x + 60 – 2x – 10 – 24 =30
    -> (30x – 2x) + (60 – 10 – 24) = 30
    -> 28x + 26 = 30
    -> 28x = 4
    -> x = 1/7
    Vậy x = 1/7
    ———————
    e, (3x+9).(11 – x) =0
    -> 3.(x + 3).(11 – x) = 0
    -> $\left[\begin{matrix} x+3=0\\ 11 – x=  0\end{matrix}\right.$
    -> $\left[\begin{matrix} x=-3\\ x = 11\end{matrix}\right.$
    Vậy x ∈ {-3 ; 11}
    ———————
    => Sửa đề:
    f, -3.(x – 2)^3 = 81
    -> (x – 2)^3 = 81 : (-3)
    -> (x – 2)^3 =-27 = (-3)^3
    -> x – 2 = -3
    -> x = -3 + 2
    -> x = -1
    Vậy x = -1
    ∘ dariana

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

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