Question

12 .5×0 .9×0 .8的简便算法？

Answer 1

巧算12.5×0.9×0.8
解题思路:四则运算规则(按顺序计算,先算乘除后算加减,有括号先算括号,有乘方先算乘方)即脱式运算(递等式计算)需在该原则前提下进行
解题过程:
12.5×0.9×0.8

=12.5×0.8×0.9

=10×0.9

=9

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Answer 2

12.5×0.9×0.8
＝12.5×2×0.4×0.9
＝25×0.4×0.9
＝10×0.9
＝9

Answer 3

12.5×0.9×0.8
＝12.5×0.8×0.9
＝10×0.9
＝9

Answer 4

12.5*0.9*0.8
=12.5*0.8*0.9
=100*0.9
=90

Answer 5

12.5×0.9×0.8
＝12.5×0.8×0.9
＝10×0.9
＝9