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

Toán Lớp 6: Tính nhanh: a, -5/9 + 3/5 – 3/9 + -2/5 b, 5/17 – 9/15 – 2/17 + -2/5 c, -5/13 – ( 3/5 + 3/13 – 4/10) d, ( 1/9 – 9/17) + 3/6 – ( 12/17 –

Tháng Mười Hai 21, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Tính nhanh:
a, -5/9 + 3/5 – 3/9 + -2/5
b, 5/17 – 9/15 – 2/17 + -2/5
c, -5/13 – ( 3/5 + 3/13 – 4/10)
d, ( 1/9 – 9/17) + 3/6 – ( 12/17 – 1/2 ) + 5/9

Comments ( 2 )

  1. cattien
    cattien
    21 Tháng Mười Hai, 2022 at 12:31 chiều
    Reply
    Giải đáp+Lời giải và giải thích chi tiết:
    a) (-5)/9 +3/5 – 3/9 +(-2)/5
    =((-5)/9 – 3/9)  +(3/5 – 2/5)
    =(-8)/9 + 1/5
    = (-40)/(45) + 9/(45)
    = (-31)/(45)
    b) 5/(17) – 9/(15) – 2/(17) +(-2)/5
    =(5/(17) – 2/(17) ) – (9/(15) + 2/5)
    = 3/(17) – (3/5 + 2/5)
    = 3/(17) – 1
    =  (3)/(17) – (17)/(17)
    = -(11)/(17)
    c) (-5)/(13) – (3/5 +3/(13) – 4/(10))
    =(-5)/(13) – 3/5-3/(13) +4/(10)
    = ((-5)/(13)-3/(13)) – (3/5 – 4/(10))
    = (-8)/(13) – (3/5 – 2/5)
    = (-8)/(13) – 1/5
    =  (-40)/(65) – (13)/(65)
    = -(53)/(65)
    d) (1/9 – 9/(17)) + 3/6 – ((12)/(17) – 1/2)+5/9
    =1/9 – 9/(17)+3/6 – (12)/(17) + 1/2 +5/9
    =-(9/(17)+(12)/(17))+(1/9 + 5/9) + (3/6 + 1/2)
    = (-21)/(17) +6/9 + (1/2+1/2)
    =(-21)/(17) +2/3 + 1
    =(-63)/(51) + (34)/(51) + (51)/(51)
    = (22)/(51)

  2. cobexinhdep
    cobexinhdep
    21 Tháng Mười Hai, 2022 at 12:30 chiều
    Reply
    a)-5/9+3/5-3/9+-2/5
    =(-5/9-3/9)+(3/5-2/5)
    =-8/9+1/5
    =-40/45+9/45
    =-31/45 
    b)5/17-9/15-2/17+-2/5
    =(5/17-2/17)+(-9/15-2/5)
    =3/17+(-9/15-6/15)
    =3/17-15/15
    =3/17-1
    =-14/17 
    c)-5/13-(3/5+3/13-4/10)
    =-5/13-3/5-3/13+4/10
    =(-5/13-3/13)+(-3/5+4/10)
    =-8/13+(-3/5+2/5)
    =-8/13-1/5
    =-40/65-13/65
    =-53/65
    d)(1/9-9/17)+3/6-(12/17-1/2)+5/9
    =1/9-9/17+3/6-12/17+1/2+5/9
    =(1/9+5/9)+(-9/17-12/17)+(3/6+1/2)
    =6/9-21/17+(1/2+1/2)
    =2/3-21/17+2/2
    =2/3-21/17+1
    =34/51-63/17+51/51
    =22/51

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

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