0.225×0.335+0.335×0.775+0.775×0.225=______．
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0.225×0.335+0.335×0.775+0.775×0.225
=0.335×（0.225+0.775）+0.775×0.225
=0.335+0.775×0.225
=0.335+0.174735
=0.509735
=0.335×（0.225+0.775）+0.775×0.225
=0.335+0.775×0.225
=0.335+0.174735
=0.509735
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