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

Toán Lớp 6: giúp mik nha TÌM X a, x+(-111)=-20 b, -11- ( x + 20 ) = 15 c, 12 – x + ( -1) = 115

Toán Lớp 6: giúp mik nha
TÌM X
a, x+(-111)=-20
b, -11- ( x + 20 ) = 15
c, 12 – x + ( -1) = 115

Comments ( 2 )

  1. a) x+(-111)=-20
    <=> x – 111 = -20
    <=> x = -20 + 111
    <=> x = 91
    b) -11- ( x + 20 ) = 15
    <=> x + 20 = -11 – 15
    <=> x + 20 = -26
    <=> x = -26 – 20
    <=> x = -46
    c) 12 – x + ( -1) = 115
    <=> 12 – x – 1 = 115
    <=> 11 – x = 115
    <=> x = 11 – 115
    <=> x = -104

  2. a) x + ( – 111) = – 20
    => x = – 20 – ( – 111)
    => x = -20 + 111
    => x = 91
    Vậy : x = 91
    b) – 11 – ( x + 20) = 15
    => x + 20 = – 11 – 15
    => x + 20 = – 26
    => x = -26 – 20
    => x = -46
    Vậy :  x = -46
    c) 12 – x + ( – 1) = 115
    => 12 – x = 115 – ( – 1)
    => 12 – x = 115 + 1
    => 12 – x = 116
    => x = 12 – 116
    => x = – 104
    Vậy :  x = – 104

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

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