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

Toán Lớp 6: b1:tính(nếu có thể hãy tính nhanh a) (-5)^3-(3^3+4).(-2)+(3-27) b)625-(61-17).12+(27+24):17 b2:tìm x biết a) (-4)^3+x=2021 b) (

Toán Lớp 6: b1:tính(nếu có thể hãy tính nhanh
a) (-5)^3-(3^3+4).(-2)+(3-27)
b)625-(61-17).12+(27+24):17
b2:tìm x biết
a) (-4)^3+x=2021
b) (10-4.x)+120:2^3=17
c)2.x-1=5
d)x-(-33)=17

Comments ( 2 )

  1. 1.
    a, (-5)^3 – (3^3 + 4). (-2) + (3 – 27)
    = -125 – (27 + 4). (-2) + (-24)
    = -125 – 31. (-2) – 24
    = -125 – (-62) – 24
    = -125 + 62 – 24
    = -87
    b, 625 – (61 – 17). 12 + (27 + 24) : 17
    = 625 – 44. 12 + 51 : 17
    = 625 – 528 + 3
    = 97 + 3
    = 100
    2.
    a, (-4)^3 + x = 2021
    => -64 + x = 2021
    => x = 2021 + 64
    => x = 2085
    Vậy x = 2085
    b, (10 – 4x) + 120 : 2^3 = 17
    => (10 – 4x) + 120 : 8 = 17
    => (10 -4x) + 15 = 17
    => 10 – 4x = 17 – 15
    => 10 – 4x = 2
    => 4x = 10 – 2
    => 4x = 8
    => x = 2
    Vậy x = 2
    c, 2x – 1 = 5
    => 2x = 5+1
    => 2x = 6
    => x = 6 : 2
    => x = 3
    Vậy x = 3
    d, x – (-33) = 17
    => x + 33 = 17
    => x = 17 – 33
    => x = -16
    Vậy x = -16
     

  2. $\text{Bài 1:}$
    a) ( – 5 )^3 – ( 3^3 + 4 ) . ( – 2 ) + ( 3 – 27 )
    = – 125 – ( 27 + 4 ) . ( – 2 ) – 24
    = – 125 – 24 – 31 . ( – 2 )
    = – 149 + 62
    = – 87
    b) 625 – ( 61 – 17 ) . 12 + ( 27 + 24 ) : 17
    = 625 – 44 . 12 + 51 : 17
    = 625 – 528 + 3
    = 97 + 3
    = 100
    $\text{Bài 2:}$
    a) ( – 4 )^3 + x = 2021
    – 64 + x = 2021
    x = 2021 + 64
    x = 2085
    b) ( 10 – 4x ) + 120 : 2^3 = 17
    ( 10 – 4x ) + 15 = 17
    10 – 4x = 17 – 15
    4x = 10 – 2
    x = 8 : 4
    x = 2
    c) 2x – 1 = 5
    2 . x = 5 + 1
    x = 6 : 2
    x = 3
    d) x – ( – 33 ) = 17
    x = 17 – 33
    x = – 16

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