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

Toán Lớp 6: – (+84) +213 =-16 125: (3x – 13) = 25 .3(2x + 1) – 19 = 14 175 – 5(x + 3) = 85

Toán Lớp 6: – (+84) +213 =-16
125: (3x – 13) = 25
.3(2x + 1) – 19 = 14
175 – 5(x + 3) = 85

Comments ( 2 )

  1. -(x+84)+213=-16
    =>-(x+84)=-16-213
    =>-x-84=-229
    =>-x=-229+84
    =>-x=-145
    =>x=145
    Vậy x=145
    $\\$
    125:(3x-13)=25
    =>3x-13=125:25
    =>3x-13=5
    =>3x=5+13
    =>3x=18
    =>x=18:3
    =>x=6
    Vậy x=6
    $\\$
    3.(2x+1)-19=14
    =>3.(2x+1)=14+19
    =>3.(2x+1)=33
    =>2x+1=33:3
    =>2x+1=11
    =>2x=11-1
    =>2x=10
    =>x=10:2
    =>x=5
    Vậy x=5
    $\\$
    175-5.(x+3)=85
    =>5.(x+3)=175-85
    =>5.(x+3)=90
    =>x+3=90:5
    =>x+3=18
    =>x=18-3
    =>x=15
    Vậy x=15
     

  2. Giải đáp:
    125 : ( 3x – 13 ) = 25
    3x – 13 = 125 : 25
    3x – 13 = 5
    3x = 5 + 13
    3x = 18
    x = 6
    3( 2x + 1 ) – 19 = 14
    3( 2x + 1 ) = 14 + 19
    3( 2x + 1 ) = 33
    2x + 1 = 33 : 3
    2x + 1 = 11
    2x = 11 – 1
    2x = 10
    x = 5
    175 – 5( x + 3 ) = 85
    5 ( x + 3 ) = 175 – 85
    5 ( x + 3 ) = 90
    x + 3 = 90 : 5
    x + 3 = 18
    x = 18 – 3
    x = 15
    ~ Câu a mình không biết x ở đâu nên mình không biết làm ạ. ~
    #AkiSha2007
     

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

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