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

Toán Lớp 6: (x+2)+(x+4)+-.+(x+30)=10000 giải tìm x nhanh nha

Toán Lớp 6: (x+2)+(x+4)+…..+(x+30)=10000 giải tìm x nhanh nha

Comments ( 2 )

  1. (x+2)+(x+4)+…+(x+30)=10000
    =>x+2+x+4+…+x+30=10000
    =>(x+x+…+x)+(2+4+…+30)=10000
    =>15x+(30+2).15:2=10000
    =>15x+240=10000
    =>15x=9760
    =>x=1952/3
    Vậy x=1952/3

  2. (x + 2) + (x + 4) + … + (x + 30) = 10000
    (x + x + … + x) + (2 + 4 + …. + 30) = 10000
    x15 + (30 + 2) . 15 : 2 = 10000
    x15 + 240 = 10000
    x15 = 10000 – 240
    x15 = 9760
    x = 9760 : 15
    x = 1952/3
     

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

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