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

Toán Lớp 4: bài 19 : tính 1, -1+3-5+7-9+11 2, 2-4+5-8+10-12 3,1-3+5-7+9-11

Toán Lớp 4: bài 19 : tính
1, -1+3-5+7-9+11
2, 2-4+5-8+10-12
3,1-3+5-7+9-11

Comments ( 2 )

  1. -1+3-5+7-9+11
    = ( -1 + 3 ) + ( -5 + 7 ) + ( -9 + 11)
    =    2  + 2 + 2 = 6
    2-4+5-8+10-12
    = ( 2 – 4 ) + ( 6 – 8 ) + ( 10 – 12 )
    = -2 + -2 + -2 = -6
    1-3+5-7+9-11
    ( 1 – 3 ) + ( 5 – 7 ) + ( 9 – 11  )
    = -2 + -2 + -2 = -6
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    1, -1+3-5+7-9+11
    = -(1-3)-(5-7)-(9-11)
    = 2+2+2
    = 6
    2, 2-4+5-8+10-12
    = (2-4)+(5-8)+(10-12)
    = (-2)-3-2
    = -7
    3,1-3+5-7+9-11
    = (-2)+(-2)+(-2)
    = -6

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

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