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

Toán Lớp 7: căn bậc hai của 25/49 :9/4+1/9-23/7.4/9 giúp với

Toán Lớp 7: căn bậc hai của 25/49 :9/4+1/9-23/7.4/9
giúp với

Comments ( 2 )

  1. $\sqrt[]{25/49}$ :9/4 + 1/9 – 23/7 . 4/9
    =5/7 . 4/9 + 1/9 – 23/7 . 4/9
    =4/9 . (5/7 – 23/7) + 1/9
    =4/9 . (-18/7) + 1/9
    =(-8)/7 + 1/9
    =(-72)/63 + 7/63
    =(-65)/63

  2. sqrt(25/49):9/4+1/9-23/7. 4/9
    =5/7:9/4+1/9-23/7. 4/9
    =5/7. 4/9+1/9-23/7. 4/9
    = 4/9.(5/7-23/7)+1/9
    = 4/9.(-18/7)+1/9
    =-8/7+1/9
    =-65/63

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

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