1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.原式_____________________=_______________________=_______________________

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1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.原式_____________________=_______________________=_______________________

1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.原式_____________________=_______________________=_______________________
1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.
原式_____________________
=_______________________
=_______________________

1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.原式_____________________=_______________________=_______________________
1+(3-4)+(-5+6)+(8-9)+(-10+11)=1

1+3-4-5+6+8-9-10+11=1
=1+(3-4)+(-5+6)+(8-9)+(-10+11)
=1