rút gọn biểu thức a)-35-(x+23)+61 b)-15-(x+13)+11 c)127-(127-x)+23 d)17-(x-17)+13 e)107-(107+x-23) f)34-(x+34-13)

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1. a) -35 – (x + 23) + 6

   = – 35 – x – 23 + 6

   = ( -35 + 6 )  – x – 23

   =        -29      – x – 23

   =  ( – 29 -23 ) -x

   =       – 52 – x

   b) -15 – (x + 13) + 11

   = – 15 – x – 13 + 11

   = ( -15 + 11 ) – x – 13

   =         – 4      – x – 13

   = ( -4 -13) – x

   =    – 17 – x

   c) 127 – (127 – x) + 2

   = 127 – 127 + x + 2

   = ( 127 – 127 ) + x + 2

   =         0          + x + 2

   =          2 + x

   d) 17 – (x – 17) + 13

   =  17 – x + 17 + 13

   = ( 17 – 17 ) – x + 13

   =   0            – x + 13

   = ( 0 + 13 ) -x

   =     13        -x

   e) 107 – (107 + x – 23)

   = 107 – 107 – x + 23

   = ( 107 -107 ) -x + 23

   =         0         -x + 23

   = ( 0 + 23 ) – x

   =     23       – x

   f) 34 – ( x + 34 – 13)

   = 34 – x – 34 + 13

   = ( 34 – 34 ) -x + 13

   =       0        -x + 13

   = ( 0+ 13 ) – x

   =     13      – x

    

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2. `a)-35-(x+23)+61`

   `=-35-x-23+61`

   `=(-35-23+61)-x`

   `=3-x`

   `b)-15-(x+13)+11`

   `=-15-x-13+11`

   `=(-15-13+11)-x`

   `=-17-x`

   `c)127-(127-x)+23`

   `=127-127+x+23`

   `=(127-127+23)+x`

   `=x+23`

   `d)17-(x-17)+13`

   `=17-x+17+13`

   `=(17+17+13)-x`

   `=47-x`

   `e)107-(107+x-23)`

   `=107-107-x+23`

   `=(107-107+23)-x`

   `=23-x`

   `f)34-(x+34-13)`

   `=34-x-34+13`

   `=(34-34+13)-x`

   `=13-x`

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