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

Toán Lớp 6: E,-2/5.(5/17-9/15)-2/5(2/17+-2/5)

Tháng Mười Hai 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: E,-2/5.(5/17-9/15)-2/5(2/17+-2/5)

Comments ( 2 )

  1. thanhbinh2k5
    thanhbinh2k5
    17 Tháng Mười Hai, 2022 at 8:59 sáng
    Reply
    E = -2/5 . (5/17 – 9/15 ) – 2/5 . ( 2/17 + -2/5 )
    E = -2/5 . (5/17 – 3/5 – 2/17 + -2/5 )
    E = -2/5 . ( 1/17 – 3/5 + -2/5 )
    E = -2/5 . [ 1/17 – ( 3/5 + 2/5 )]
    E = -2/5 . [ 1/17 – 1]
    E = -2/5 . -17/17
    E = -2/5 . -1
    E = 2/5

  2. cobexinhdep
    cobexinhdep
    17 Tháng Mười Hai, 2022 at 8:58 sáng
    Reply
    E= -2/5(5/(17)-9/(15))-2/5(2/(17)-2/5)
    ⇔E=-2/5(5/(17)+2/(17)-3/5-2/5)
    E=-2/5(7/17-1)
    E=-14/85+2/5
    E=(-14+34)/(85)
    E=(20)/(85)=4/(17)
     

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

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