能用简便方法计算的要简算.
32×125%×0.2512.5-0.625一×[-(-)]1÷[(+)÷].
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解:
(1)32×125%×0.25,
=(4×8)×0.125×0.25,
=(8×0.125)×(4×0.25),
=1×1,
=1;
(2)12.5-0.625-,
=12.5-(0.625+),
=12.5-1,
=11.5;
(3)×[-(-)],
=×[-+],
=×[+-],
=×[1-],
=×,
=;
(4)1÷[(+)÷],
=1÷[÷],
=1÷,
=.
解析分析:(1)根据乘法交换律和结合律进行计算;
(2)根据连减的性质进行计算;
(3)中括号根据连减的性质进行计算,再算乘法;
(4)先算加法,再算中括号里面的除法,最后算括号外面的除法.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.