(-1/4)+5/6+2/3-1/2
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(-1/4)+5/6+2/3-1/2(-1/4)+5/6+2/3-1/2(-1/4)+5/6+2/3-1/2(-1/4)+5/6+2/3-1/2=5/6+4/6-1/4-2/4=3/2-3/4=3/4
(-1/4)+5/6+2/3-1/2
(-1/4)+5/6+2/3-1/2
(-1/4)+5/6+2/3-1/2
(-1/4)+5/6+2/3-1/2
=5/6+4/6-1/4-2/4
=3/2-3/4
=3/4
答案3/2
3/2
(-1/4)+5/6+2/3-1/2
2/3,1,6/5,4/3,( ),3/2
1234567654321*(1+2+3+4+5+6+7+6+5+4+3+2+1)
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