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

Toán Lớp 6: tìm x thuộc Z a) (3x – 5) mũ 3 – 12 = 15 b) ( 4 – 2x) + (-3) = (-5) . (-9)

Toán Lớp 6: tìm x thuộc Z
a) (3x – 5) mũ 3 – 12 = 15
b) ( 4 – 2x) + (-3) = (-5) . (-9)

Comments ( 2 )

  1. a) ( 3x – 5 )^3 – 12 = 15
    ( 3x – 5 )^3 = 15 + 12
    ( 3x – 5 )^3 = 3^3
    ⇒ 3x = 3 + 5
    ⇒ x = 8 : 3
    ⇒ x = 8/3
    Vậy x = 8/3
    b) ( 4 – 2x ) + ( – 3 ) = ( – 5 ) . ( – 9 )
    4 – 2x = 45 – ( – 3 )
    2x = 4 – 48
    x = – 44 : 2
    x = – 22
     Vậy x = – 22

  2. a) (3x – 5)^3  – 12 = 15
    (3x-5)^3=15+12
    (3x-5)^3=27
    (3x-5)^3=3^3
    =>3x-5=3
    =>3x=3+5
    =>3x=8
    =>x=8:3
    =>x=8/3
    b) ( 4 – 2x) + (-3) = (-5) . (-9)
    (4-2x)+(-3)=45
    4-2x=45-(-3)
    4-2x=48
    2x=4-48
    2x=-44
    x=(-44):2
    x=-22

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