计算下面各题.
[1-(+)]÷.
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解:(1)15÷÷,
=15××,
=10;
(2)25-÷,
=25-×,
=25-10,
=15;
(3)(+÷)×,
=(+×)×,
=(+)×,
=1×,
=;
(4)(-)÷(+),
=÷,
=×,
=;
(5)÷3×,
=××,
=;
(6)[1-(+)]÷,
=[1-]×4,
=×4,
=.
解析分析:(1)(5)把除法改为乘法,约分计算;
(2)先算除法,再算加法;
(3)先算括号内的除法,再算括号内的加法,最后算括号外的乘法;
(4)两个括号同时计算,最后算除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
点评:此题考查了分手肚饿四则混合运算,注意运算顺序和运算法则.