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

Toán Lớp 6: tính nhanh -359 + 187 + ( -123 ) + 350 + ( -172 )

Toán Lớp 6: tính nhanh
-359 + 187 + ( -123 ) + 350 + ( -172 )

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    (-359 )+ 187 + ( -123 ) + 350 + ( -172 )
    = (-359) + 187 – 123 + 350 – 172
    =[ ( -359) + 350 )] – ( 123 + 172 ) + 187
    = (-9) – 295 + 187
    = -[(9 + 295) – 187 ]
    =-(304-187)
    =(-117)

  2. -359 + 187 + ( -123 ) + 350 + ( -172 )
    = -359 + 187 – 123 + 350 – 172
    = ( -359 + 350 ) – ( 123 + 172 ) + 187
    = -9 – 295 + 187
    = -( 9 + 295 – 187 )
    = -( 304 – 187 )
    = -117
     

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