脱式计算 (+)÷+9÷[1-()]1.02÷(5+0.4×0.25)
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解:(1)(+)÷+,
=,
=,
=;
(2)9÷[1-()],
=9÷[1-],
=9÷,
=27;
(3)1.02÷(5+0.4×0.25),
=1.02÷(5+0.1),
=1.02÷5.1,
=0.2.
解析分析:(1)先算括号里面的加法,再算括号外面的除法,最后算括号外面的加法,
(2)先算小括号里面的,再算中括号里面的,最后算除法,
(3)先算括号里面的乘法,再算加法,最后算括号外面的除法.
点评:本题主要考查了学生四则运算的计算能力.