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

Toán Lớp 7: (x+1)+(x+2)+(x+3)+…+(x+37)=999

Toán Lớp 7: (x+1)+(x+2)+(x+3)+…+(x+37)=999

Comments ( 2 )

  1. (x+1)+(x+2)+(x+3)+…+(x+37)=999
     =>\underbrace{x+x+x+…+x}_{37x} + (1+2+3+…+37) = 999
    => 37x + 703 = 999
    => 37x = 999 – 703
    => 37x = 296
    => x = 296 : 37
    => x = 8
    Vậy x = 8

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

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