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

Toán Lớp 5: 66,72:x – 29,64:x=3 c) x: 0,125-x =49

Toán Lớp 5: 66,72:x – 29,64:x=3
c) x: 0,125-x =49

Comments ( 2 )

  1. 66,72 : x – 29,64 : x = 3
    ( 66,72 – 29,64 ) : x = 3
    37,08 : x = 3
    x = 37,08 : 3
    x = 12,36
    x : 0,125 – x =49
    x : 1/8 – x = 49
    x . 8 – x = 49
    x.7 = 49
    x = 49 : 7
    x = 7
     

  2. $\#phnn$
    a)66,72:x-29,64:x=3
    <=>66,72. 1/x-29,64 .1/x=3
    <=>1/x . (66,72-29,64)=3
    <=>1/x .37,08=3
    <=>1/x =3:37,08
    <=>1/x=25/209
    <=>x=1/(25/209)
    <=>x=309/25
    $\\$ b)x:0,125-x=49
    <=>x:1/8-x=49
    <=>x.8-x=49
    <=>7x=49
    <=>x=49:7
    <=>x=7

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