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

Toán Lớp 6: tính nhanh a.(2354-45)-2354 b.(-2009)-(234-2009) c.(16+23)+(153-16-23) d.(134-167+45)-(134+45) mik vote 5 sao ạ

Toán Lớp 6: tính nhanh
a.(2354-45)-2354
b.(-2009)-(234-2009)
c.(16+23)+(153-16-23)
d.(134-167+45)-(134+45)
mik vote 5 sao ạ

Comments ( 2 )

  1. Giải đáp:
     a(2354-45)-2354
    =2354-2354-45
    =0-45
    =-45
    (-2009)-(234-2009)
    =(-2009–2009)-234
    =(-2009+2009)( hai dấu trừ với nhau thì thành cộng)-234
    =0-234
    =-234
    (16+23)+(153-16-23)
    =16+23+153-16-23
    =(16-16)+(23-23)+153
    =0+0+153
    =153
    (134-167+45)-(134-45)
    =(134-134)-(45-45)+167
    =0-0+167
    =167
    Chúc bạn học tốt 
     

  2. a,
    (2354-45)-2354
    =2354-45-2354
    =(2354-2354)-45
    =0-45
    =-45
    $\\$
    b,
    (-2009)-(234-2009)
    =-2009-234+2009
    =(2009-2009)-234
    =0-234
    =-234
    $\\$
    c,
    (16+23)+(153-16-23)
    =16+23+153-16-23
    =(16-16)+(23-23)+153
    =0+0+153
    =153
    $\\$
    d,
    (134-167+45)-(134+45)
    =134-167+45-134-45
    =(134-134)+(45-45)-167
    =0+0-167
    =167
     

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