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

Toán Lớp 4: Tính bằng cách thuận tiện: a) 450 : (3 x 5) b) (45 x 6) : 9

Toán Lớp 4: Tính bằng cách thuận tiện:
a) 450 : (3 x 5)
b) (45 x 6) : 9

Comments ( 2 )

  1. a) 450 : (3 xx 5)
    = 450 : 5 : 3
    = 90 : 3
    = 30
    b) (45 xx 6) : 9
    = 45 : 9 xx 6
    = 5 xx 6
    =30

  2. a) 450 : ( 3 × 5 )
    = 450 : 5 : 3
    = 90 : 3
    = 30  
    b) ( 45 × 6 ) : 9
    = 45 : 9 × 6
    = 5 × 6
    = 30  

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