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

Toán Lớp 6: Tìm x: lop6 Giúp em đyy, em ngu toán. a) 75:(x-18)= 5 mũ 2 b) ( 2x – 6) . 4 mũ 7=4 mũ 9 c)740 : ( x + 10)=10 mũ 2 – 2.13 d)(27.x + 6) :

Toán Lớp 6: Tìm x: lop6
Giúp em đyy, em ngu toán.
a) 75:(x-18)= 5 mũ 2
b) ( 2x – 6) . 4 mũ 7=4 mũ 9
c)740 : ( x + 10)=10 mũ 2 – 2.13
d)(27.x + 6) : 3 – 11 = 9
e) (15 – 6x). 3 mũ 5 = 3 mũ 6
f) 5 ( x + 35 ) = 515
g) 6.x – 5 = 19
h) 12x – 33 = 3 mũ 2 .3 mũ 3
i) 4. (x – 12) + 9 = 17
dấu chấm là nhân nha!

Comments ( 2 )

  1. ~ gửi bạn ~
    Giải đáp:
    … 
    Lời giải và giải thích chi tiết:
    a) 75 : (x – 18) = 5^2
    => 75 : (x – 18) = 25
    => x – 18 = 75 : 25
    => x – 18 = 3
    => x = 3 + 18
    => x = 21
    Vậy x = 21
    ——-
    b) (2x – 6) xx  4^7 = 4^9
    =>2x – 6 = 4^9 : 4^7
    => 2x – 6 = 4^2
    => 2x – 6 = 16
    => 2x = 16 + 6
    => 2x = 22
    => x= 22:2
    => x = 11
    Vậy x = 11
    ——-
    c) 740 : (x + 10) = 10^2 – 2 xx 13
    => 740 : (x + 10) = 100 – 26
    => 740 : (x + 10) = 74
    => x + 10 = 740 : 74
    => x + 10 = 10
    => x = 10 – 10
    => x = 0
    Vậy x = 0
    ——-
    d) (27 xx x + 6): 3 – 11 = 9
    => (27 xx x + 6):3 = 9 + 11
    => (27 xx x + 6): 3 = 20
    => 27 xx x + 6 = 60
    => 27 xx x = 54
    => x = 54 : 27
    => x = 2
    Vậy x = 2
    ——-
    e) (15 – 6x) xx 3^5 = 3^6
    => 15 – 6x = 3^6 : 3^5
    => 15 – 6x = 3
    => 6x = 15 – 3
    => 6x = 12
    => x = 12 : 6
    => x = 2
    Vậy x = 2
    ——-
    f) 5 xx (x + 35) = 515
    => x + 35 = 515 : 5
    => x + 35 = 103
    => x = 103 – 35
    => x = 68
    Vậy x = 68
    ——-
    g) 6 xx x – 5 = 19
    => 6 xx x = 19 + 5
    => 6 xx x = 24
    => x = 24 : 6
    => x = 4
    Vậy x = 4
    ——-
    h) 12x – 33 = 3^2 xx 3^3
    => 12x – 33 = 3^5
    => 12x – 33 = 243
    => 12x = 243 + 33
    => 12x = 276
    => x = 276 : 12
    => x = 23
    Vậy x = 23
    ——-
    i) 4 xx (x – 12) + 9 = 17
    => 4 xx (x – 12) = 17 – 9
    => 4 xx (x -12) = 8
    => x – 12 = 8:4
    => x – 12 = 2
    => x = 2 + 12
    => x = 14
    Vậy x = 14

  2. a) 75 : ( x – 18 ) = $5^{2}$ 
    ⇔ 75 : ( x – 18 ) = 25
    ⇔ x – 18 = 75 : 25
    ⇔ x – 18 = 3
    ⇔ x = 3 + 18
    ⇔ x = 21
    b) ( 2x – 6 ) * $4^{7}$ = $4^{9}$ 
    ⇔ 2x – 6 = $4^{9}$ : $4^{7}$ 
    ⇔ 2x – 6 = $4^{2}$ 
    ⇔ 2x = 16 + 6
    ⇔ 2x = 22
    ⇔ x = 22 : 2
    ⇔ x = 11
    c) 740 : ( x + 10 )= $10^{2}$ – 2 * 13
    ⇔ 740 : ( x + 10 ) = 100 – 26
    ⇔ 740 : ( x + 10 ) = 74
    ⇔ x + 10 = 740 : 74
    ⇔ x = 10 – 10
    ⇔ x = 0
    d) ( 27 * x + 6 ) : 3 – 11 = 9
    ⇔ 27 * x + 6 = ( 9 + 11 ) * 3
    ⇔ 27 * x + 6 = 20 * 3
    ⇔ 27 * x + 6 = 60
    ⇔ 27 * x = 60 – 6
    ⇔ 27 * x = 54
    ⇔ x = 54 : 27
    ⇔ x = 2
    e) ( 15 – 6x ) * $3^{5}$ = $3^{6}$ 
    ⇔ 15 – 6x = $3^{6}$ – $3^{5}$
    ⇔ 15 – 6x = 3
    ⇔ 6x = 15 – 3
    ⇔ 6x = 12
    ⇔ x = 12 : 6
    ⇔ x = 2
    f) 5 ( x + 35 ) = 515
    ⇔ x + 35 = 515 : 5
    ⇔ x + 35 = 103
    ⇔ x = 103 – 35
    ⇔ x = 38
    g) 6 * x – 5 = 19
    ⇔ x = ( 19 + 5 ) : 6
    ⇔ x = 24 : 6
    ⇔ x = 4
    h) 12x – 33 = $3^{2}$ * $3^{3}$
    ⇔ 12x – 33 = $3^{5}$
    ⇔ 12x – 33 = 243
    ⇔ 12x = 243 + 33
    ⇔ 12x = 276
    ⇔ x = 276 : 12
    ⇔ x = 23
    i) 4 * ( x – 12 ) + 9 = 17
    ⇔ x – 12 = ( 17 – 9 ) : 4
    ⇔ x – 12 = 8 : 4
    ⇔ x – 12 = 2
    ⇔ x = 2 + 12
    ⇔ x = 14
    #$Gin :333$

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

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