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

Toán Lớp 6: Tính nhanh : a) 8 – 37 + 70 – 8 + 37 – 70 + 10 b) -|-49|+ (- 42) – (- 49) + 42 d) -39.(5 – 99) +99.(10 – 39)

Toán Lớp 6: Tính nhanh :
a) 8 – 37 + 70 – 8 + 37 – 70 + 10
b) -|-49|+ (- 42) – (- 49) + 42
d) -39.(5 – 99) +99.(10 – 39)

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a, 8 – 37 + 70 – 8 + 37 – 70 + 10
    = ( 8-8) + (-37+37) + (70-70)+10
    = 10
    b, -|-49| + (-42) – (-49) + 42
    = -49 – 42 + 49 + 42
    = (-49+49)+(-42+42)
    = 0
    c, -39 . (5-99) + 99 . (10-39)
    = (-39) . 5 + 39 . 99 + 99 . 10 + (-39) . 99
    = 99 . ( 39 + 10 – 39 ) + (-39) . 5
    = 99 . 10 – 195
    = 990 – 195=795

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

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