题目内容
【题目】脱式计算,能简算的要简算.
0.125×0.25×32
1500﹣18×120÷25
×101﹣0.75
÷[×(0.4+)]
÷[(+)×].
【答案】1,1413.6,75, ,3
【解析】
试题分析:(1)把32看作4×8,运用乘法交换律与结合律简算;
(2)先算乘除,再算减法;
(3)把分数改为小数0.75,运用乘法分配律简算;
(4)(5)题先算小括号内的,再算中括号内的,最后算括号外的.
解:(1)0.125×0.25×32,
=0.125×0.25×4×8,
=0.125×8×(0.25×4),
=1×1,
=1;
(2)1500﹣18×120÷25,
=1500﹣86.4,
=1413.6;
(3)×101﹣0.75,
=0.75×101﹣0.75,
=(101﹣1)×0.75,
=100×0.75,
=75;
(4)÷[×(0.4+)],
=÷[×(+)],
=÷[×],
=÷,
=×,
=;
(5)÷[(+)×],
=÷[×],
=÷,
=×,
=3.
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