回答题：
(10-9+8-7)-(6-7+8-9)=

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E．The easiest methodis to see that both sets of parentheses contain a一9，a+8．and a一7．Because the second set is being subtracted from the first，these will all cancel out，leaving：(10—9+8—7)一(6—7+8—9)=10—6=4．This could also be calculated directly．

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回答题： (10-9+8-7)-(6-7+8-9)=

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回答题：
(10-9+8-7)-(6-7+8-9)=