问题 选择题 (0.25+2.5)×0.4=0.25×0.4+2.5×0.4运用了( )A.加法结合律B.乘法结合律C.乘法分配律 答案 (0.25+2.5)×0.4=0.25×0.4+2.5×0.4运用了乘法分配律.故答案选:C.