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

Toán Lớp 6: X+5-(11)=31-48 21+(-21+x)=252-(25+252)

Toán Lớp 6: X+5-(11)=31-48
21+(-21+x)=252-(25+252)

Comments ( 2 )

  1. x + 5 – 11 = 31 – 48
    => x + 5 – 11 = -17
    => x + 5 = (-17) + 11
    => x + 5 = -6
    => x = (-6) – 5
    => x = -11
    ————–
    21 + (-21 + x) = 252 – (25 + 252)
    => 21 + (-21 + x) = 252 – 277
    => 21 + (-21 + x) = -25
    => -21 + x = (-25) – 21
    => -21 + x = -46
    => x = (-46) – (-21)
    => x = -25

  2. $\text{ x + 5 – ( – 11 ) = 31 – 48 }$
    $\text{ x + 5 – ( – 11 ) = – 17 }$
    $\text{ x + 5                = ( -17 ) + ( – 11 ) }$
    $\text{ x + 5                = – 28 }$
    $\text{ x                       = – 28 – 5 }$
    $\text{ x                       = ( – 28 ) + ( – 5 ) }$
    $\text{ x                       = -33 }$
    $\text{ Vậy x =  – 19 }$
    $\text{ 21 + ( – 21 + x )  = 252 – ( 25 + 252 ) }$
    $\text{ 21 + ( -21 ) + x    = 252 – 25 – 252 }$
    $\text{ [21 + ( – 21 )] + x = (252 – 252) – 25 }$
          $\text{ 0              + x  =  0 – 25 }$
                            $\text{ x  = -25 }$
    $\text{ Vậy x = – 25 }$
    ___________
    $\text{ #bich2k9❤ }$

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

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