我会巧算． 1.2×0.4+1.3×0.4（1.25+0.36）×0.27.2×0.3+28×0.030.25×0.56×0.48×（2.5+0.125）0.25×0.56×0.432.8+5.6+7.275.2-66.9-5.2．