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

Toán Lớp 5: tìm x biết (101 x X + 25,5) – (25 + X ) + 0,5 = 2

Toán Lớp 5: tìm x biết (101 x X + 25,5) – (25 + X ) + 0,5 = 2

Comments ( 2 )

  1. (101 xx x + 25,5) – (25 + x) + 0,5 = 2
    101 xx x + 25,5 – 25 – x = 2 – 0,5
    (101 – 1) xx x + (25,5 – 25) = 1,5
    100 xx x + 0,5 = 1,5
    100 xx x = 1,5 – 0,5
    100 xx x = 1
    x = 1 : 100
    x = 0,01
    Vậy x = 0,01

  2. (101xx x+25,5)-(25+x)+0,5=2
    (101xx x+25,5)-(25+x)=2-0,5
    (101xx x)+25,5-25-x=1,5
    [(101xx x)-x]+(25,5-25)=1,5
    100xx x+0,5=1,5
    100xx x=1,5-0,5
    100xx x=1
    x=1:100
    x=1/00=0,01
    Vậy x=1/100=0,01

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