(0.75乘42.6-0.574乘25=57.4)除3的简便方法

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(0.75乘42.6-0.574乘25=57.4)除3的简便方法(0.75乘42.6-0.574乘25=57.4)除3的简便方法(0.75乘42.6-0.574乘25=57.4)除3的简便方法(0.7

(0.75乘42.6-0.574乘25=57.4)除3的简便方法
(0.75乘42.6-0.574乘25=57.4)除3的简便方法

(0.75乘42.6-0.574乘25=57.4)除3的简便方法
(0.75*42.6-0.574*25)/3
=(0.75*42.6-57.4*0.25)/3
=[(1-0.25)*42.6-57.4*0.25]/3
=[42.6-0.25*42.6-57.4*0.25]/3
=[42.6-0.25*(42.6+57.4)]/3
=[42.6-25]/3
=17.6/3
=5.866.