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

Toán Lớp 6: A) 27:3²+4.2³ B) (-21)+13+(-19)+57

Toán Lớp 6: A) 27:3²+4.2³
B) (-21)+13+(-19)+57

Comments ( 2 )

  1. a) 27 : 3^2 + 4 . 2^3
    = 3^3 : 3^2 + 4 . 8
    = $3^{3-2}$ + 32
    = 3 + 32
    = 35
    b) ( – 21 ) + 13 + ( – 19 ) + 57
    = – ( 21 + 19 ) + ( 13 + 57 )
    = – 40 + 70
    = 30

  2. a)27:3²+4.2³
    =27:9+4.8
    =3+32
    =35
    b)(-21)+13+(-19)+57
    =[(-21)+(-19)]+(13+57)
    =-40+70
    =30
     

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