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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