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)
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)
By Claire
By Claire
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)
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
`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`