连乘乘加乘减课件 (3)洪河屯乡上营王俊红口算:1.02×0.20.45×0.60.8×0.1250.759×00.25×0.40.067×0.10.1×0.080.85×0.4说一说下面各题的运算顺序,再计算。12×5×6030×7+85250×4-200例6:学校图书室的面积是85平方米,用边长室0.9米的正方形瓷砖铺地,100块够吗?判断:50.4×1.95-1.8=50.4×0.1=5.043.76×0.25+25.8=0.094+25.8=25.894看谁算得快。19.4×6.1×2.33.25×4.76-7.818.1×0.9...