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

Toán Lớp 6: Tính hợp lí nhất: ( -49 + 57 – 32 + 45 ) – 73 + 32 + 21 – ( 57 + 21 – 49 + 45 ) – ( -23 + 19 – 11 – 29 ) + ( – 23 + 13 – 11 ) + 87 – 29

Tháng Ba 23, 2023 Toán học 0 Comments 0 views

Toán Lớp 6: Tính hợp lí nhất:
( -49 + 57 – 32 + 45 ) – 73 + 32 + 21 – ( 57 + 21 – 49 + 45 )
– ( -23 + 19 – 11 – 29 ) + ( – 23 + 13 – 11 ) + 87 – 29

Comments ( 2 )

  1. cobexinhdep
    cobexinhdep
    23 Tháng Ba, 2023 at 3:58 sáng
    Reply
    ( – 49 + 57 – 32 + 45 ) – 73 + 32 + 21 – ( 57 + 21 – 49 + 45 )
    = – 49 + 57 – 32 + 45 – 73 + 32 + 21 – 57 – 21 + 49 – 45
    = ( 49 – 49 ) + ( 57 – 57 ) + ( 32 – 32 ) + ( 45 – 45 ) + ( 21 – 21 )  – 73
    = 0 + 0 + 0 + 0 + 0 – 73
    = – 73
    – ( – 23 + 19 – 11 – 29 ) + ( – 23 + 13 – 11 ) + 87 – 29
    = 23 – 19 + 11 + 29 – 23 + 13 – 11 + 87 – 29
    = ( 23 – 23 ) + ( 29 – 29 ) + ( 11 – 11 ) + ( 87 + 13 ) – 19
    = 0 + 0 + 0 + 100 – 19
    = 81

  2. bichquyenlien
    bichquyenlien
    23 Tháng Ba, 2023 at 3:58 sáng
    Reply
    $\text{a/ (-49 + 57 – 32 + 45) – 73 + 32 + 21 – (57 + 21 – 49 + 45)}$ $\\$ $\text{= -49 + 57 – 32 + 45 – 73 + 32 + 21 – 57 – 21 + 49 – 45 )}$ $\\$ $\text{= (-49 + 49) + (32 – 32) + (45 – 45) + (57 – 57) + (21 – 21) – 73}$ $\\$ $\text{= -73}$ $\\$ $\text{b/ -( -23 + 19 – 11 – 29) + (-23 + 13 – 11) + 87 – 29}$ $\\$ $\text{= 23 – 19 + 11 + 29 – 23 + 13 – 11 + 87 – 29}$ $\\$ $\text{= (23 – 23) + (29 – 29) + (11 – 11) + (87 + 13) – 19}$ $\\$ $\text{= 100 – 19}$ $\\$ $\text{= 81}$
     

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

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