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

Toán Lớp 6: Tìm x Câu 1: Tìm x a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41

Toán Lớp 6: Tìm x
Câu 1: Tìm x
a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41

Comments ( 2 )

  1. a) 3 . ( x + 6 ) – 5^3 = 2 . ( x – 8 ) – 1
    ⇒ 3x + 18 – 125 = 2x – 16 – 1
    ⇒ 3x – 107 = 2x – 17
    ⇒ 3x – 2x = 107 – 17
    ⇒ x = 90
    Vậy , x = 90 .
    b) ( 2 + x )^3 – 23 = 41
    ⇒ ( 2 + x )^3 = 41 + 23
    ⇒ ( 2 + x )^3 = 64
    ⇒ ( 2 + x )^3 = 4^3
    ⇒ 2 + x = 4
    ⇒ x = 4 – 2
    ⇒ x = 2
    Vậy , x = 2 .

  2. a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1
    <=>3x+18-125=2x-16-1
    <=>3x-107=2x-17
    <=>3x-2x=-17+107
    <=>x=90
    Vậy x=90
    b) ( 2 + x )^3 – 23 = 41
    <=>( 2 + x )^3=41+23
    <=>( 2 + x )^3=64
    <=>( 2 + x )^3=4^3
    <=>2 + x =4
    <=>x =2
    Vậy x=2

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