题目内容
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分析：先算小括号里面的减法，再算括号外的除法，最后算括号外的乘法．
解答：解：
÷（
-
）×
，
=
÷
×
，
=
×
，
=
．
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=
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=
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=
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点评：本题考查了四则混合运算，注意运算顺序和运算法则，把结果化成最简分数．
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