ï¼-1å1/2ï¼-1å1/4+ï¼-2å1/2ï¼-ï¼-3å3/4ï¼-ï¼-1å1/4ï¼
= -1å1/2 - 1å1/4 - 2å1/2 + 3å3/4 + 1å1/4
= -1-1/2 - 1-1/4 - 2-1/2 + 3+3/4 + 1+1/4
= -1-1-2+3+1 -1/2-1/4-1/2+3/4+1/4
= -1/4
= -1å1/2 - 1å1/4 - 2å1/2 + 3å3/4 + 1å1/4
= -1-1/2 - 1-1/4 - 2-1/2 + 3+3/4 + 1+1/4
= -1-1-2+3+1 -1/2-1/4-1/2+3/4+1/4
= -1/4
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