来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/04/30 14:53:06
2道计算题,我要的是简便的.
计算:211×(-455)+365×455-211×545+545×365=_____
37.9×0.0038+1.21×0.379+6.21×0.159=______
37.9×0.0038+1.21×0.379+6.21×0.159=0.379*0.38+1.21*0.379++6.21×0.159=1.59*0.379 + 6.21×0.159=1.59*0.379 + 0.621×1.59=1.59*1=1.59