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

Toán Lớp 6: a.( 42.43+43.57+43 ) -360.4 b. 372 -19.4 – (9819-13)

Toán Lớp 6: a.( 42.43+43.57+43 ) -360.4
b. 372 -19.4 – (9819-13)

Comments ( 2 )

  1. a)
    (42 . 43 + 43 . 57 + 43) – 360 . 4
    = 43 . (42 + 57 + 1) – 1440
    = 43 . 100 – 1440
    = 4300 – 1440
    = 2860
    b)
    372 – 19 . 4 – (9819 – 13)
    = 372 – 76 – 9806
    = 296 – 9806
    = – 9510

  2. a,
    (42 . 43 + 43 . 57 + 43) – 360 . 4
    = [43 . (42 + 57 + 1)] – 360 . 4
    = 43 . 100 – 360.4
    = 4300 – 1440
    = 2860
    b,
    372 – 19 . 4 – (9819 – 13)
    = 372 – 76 – (9819 – 13)
    = 296 – 9806
    = -9510

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

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