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

Toán Lớp 6: a>32-34+36-38+40-42 b>92-(55-8)+(-45) c>386-(287+386)-(13+0) d>332-(681+232-431) làm hộ em đang cần gấp ạ!

Toán Lớp 6: a>32-34+36-38+40-42
b>92-(55-8)+(-45)
c>386-(287+386)-(13+0)
d>332-(681+232-431)
làm hộ em đang cần gấp ạ!

Comments ( 2 )

  1. a)32-34+36-38+40-42
    =(32-34)+(36-38)+(40-42)
    =-2-2-2
    =-(2+2+2)
    =-6
    $\\$
    b)92-(55-8)+(-45)
    =92-58+8-45
    =(92+8)-(58+45)
    =100-100
    =0
    $\\$
    c)386-(287+386)-13+0
    =386-287-386-13
    =(386-386)-(287+13)
    =0-300
    =-300
    $\\$
    d)332-(681+232-431)
    =332-681-232+431
    =(332-232)-(681-431)
    =100-250
    =-150

  2. a)
    32 – 34 + 36 – 38 + 40 – 42
    = – (34 – 32) – (38 – 36) – (42 – 40)
    = – (2 + 2 + 2)
    = – 6
    b)
    92-(55-8)+(-45)
    =92-58+8-45
    =(92+8)-(58+45)
    =100-100
    =0
    c)
    386-(287+386)-13+0
    =386-287-386-13
    =(386-386)-(287+13)
    =0-300
    =-300
    d)
    332-(681+232-431)
    =332-681-232+431
    =(332-232)-(681-431)
    =100-250
    =-150

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