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

Toán Lớp 7: Thực hiện phép tính: (0,4+3/5).5/8-3/4+1/2(4/5-3)

Toán Lớp 7: Thực hiện phép tính:
(0,4+3/5).5/8-3/4+1/2(4/5-3)

Comments ( 2 )

  1. ( 0,4 + 3/5) . 5/8 – 3/4 + 1/2 ( 4/5 – 3)
    =( 2/5 + 3/5) . 5/8 – 3/4 + 1/2 ( 4/5  – 15/5)
    = 1 . 5/8 – 3/4 + 1/2 . (-11/5)
    = 5/8 – 3/4 + (-11/10)
    = 25/40 – 30/40 – 44/40
    = -40/40

  2. (0,4 + 3/5) . 5/8 -3/4 + 1/2.(4/5-3)
    =1.(5)/8-3/4 +1/2 . -11/5
     = 5/8 – 3/4 +(-11)/10
    =-49/40

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