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

Toán Lớp 6: a.9/42-7/14+10/-16 = b.(3/4+-5/2):-2/3-2/7=

Toán Lớp 6: a.9/42-7/14+10/-16 =
b.(3/4+-5/2):-2/3-2/7=

Comments ( 2 )

  1. a) 9/42 – 7/14 + 10/-16
    = 3/14 – 7/14 + -5/8
    = -4/14 + -5/8
    = -2/7 + -5/8
    = -16/56 + -35/56
    = -51/56
    b) (3/4 + -5/2) : -2/3 – 2/7
    = -7/4 : -2/3 – 2/7
    = 21/8 – 2/7
    = 131/56
     

  2. a) 9/42-7/14+10/-16
    = 9/42 – 21/42 + -10/16
    = -2/7 + -10/16
    = -51/56
    b) (3/4+-5/2):-2/3-2/7
    =  (3/4 + -10/4) ÷ -2/3 – 2/7
    =  -7/4 ÷ -2/3 – 2/7
    =  21/8 – 2/7
    = 131/56
    Học tốt!
     

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