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

Toán Lớp 6: 1.66 tìm số tự nhiên x thỏa mãn a) 16 x + 40 – 10 .$3^{2}$ + 5 . (1+2+3) b) 92 – 2 x = 2 . $4^{2}$ -3 .4 + 120 : 5

Toán Lớp 6: 1.66 tìm số tự nhiên x thỏa mãn
a) 16 x + 40 – 10 .$3^{2}$ + 5 . (1+2+3)
b) 92 – 2 x = 2 . $4^{2}$ -3 .4 + 120 : 5

Comments ( 2 )

  1. a)
    16x + 40 = 10 . 3^2 + 5 . (1 + 2 + 3)
    ⇒ 16x + 40 = 90 + 30
    ⇒ 16x = 120 – 40 = 80
    ⇒ x = 5
    b)
    92 – 2x = 2 . 4^2 – 3 . 4 + 120 : 5
    ⇒ 92 – 2x = 32 – 12 + 24
    ⇒ 92 – 2x = 44
    ⇒ 92 – 44 = 2x
    ⇒ 48 = 2x
    ⇒ x = 24

  2. a,
    16x + 40 = 10 . 3^2 + 5. (1+2+3)
    =>16x + 40 = 10 . 9 + 5 .6
    =>16x + 40 = 90 + 30
    =>16x + 40 = 120
    => 16x = 120 – 40
    => 16x = 80
    => x = 80 : 16
    => x = 5
    b,
    92 -2x = 2 . 4^2 – 3.4 + 120 : 5
    => 92 – 2x = 2 . 16 – 12 + 24
    => 92 – 2x = 32 – 12 + 24
    =>92 – 2x = 44
    => 2x = 92 – 44
    => 2x = 48
    => x = 48 : 2
    => x =24
    ~~~~~~~~GOOD LUCK~~~~~~~~
     

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

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