给你翻译下
1+2-3-4+5=1
=3-3-4+5=1
=0-4+5=1
= -4+5=1
【(1x2+3)+(4-5)x6】x7+8=1
=【(2+3)+(4-5)x6】x7+8=1
=【5+(4-5)x6】x7+8=1
=【5+-1x6】x7+8=1
=【5+-6】x7+8=1
=-1x7+8=1
=-7+8=1
1+2-3-4+5=1+1-2+3-4-5+6-7+8=1
(1+2)×3÷(4+5)=1
1×2+3-(4+5-6)+7-8=1