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

Toán Lớp 7: thực hiện phép tính 12,5 . ( -5/7) + 1,5 . ( – 5/7) 3/7 + ( -5/2) + ( -3/5)

Toán Lớp 7: thực hiện phép tính
12,5 . ( -5/7) + 1,5 . ( – 5/7)
3/7 + ( -5/2) + ( -3/5)

Comments ( 2 )

  1. 12,5 . ( – 5/7 ) + 1,5 . ( – 5/7 )
    = ( – 5/7 ) . ( 12,5 + 1,5 )
    = ( – 5/7 ) . 14
    = – 10
    ____________________________________
    3/7 + ( – 5/2 ) + ( – 3/5 )
    = 30/70 + ( – 175 )/70 + ( – 42 )/70
    = ( – 145 )/70 + ( – 42 )/70
    = ( – 187 )/70

  2. 12,5 . ( -5/7) + 1,5 . ( – 5/7)
    = ( -5/7 ) . ( 12,5 + 1,5 )
    = ( -5/7 ) . 14
    = -10
    3/7 + ( -5/2) + ( -3/5)
    = ( 30/70 ) + ( -175/70 ) + ( -42/70 )
    = -187/70

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