简便计算:57×55/56+27×27/28
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:综合作业 时间:2024/07/29 23:02:19
简便计算:57×55/56+27×27/28
![简便计算:57×55/56+27×27/28](/uploads/image/z/3148190-62-0.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%EF%BC%9A57%C3%9755%2F56%2B27%C3%9727%2F28)
57×55/56+27×27/28
=57×55/56+27×54/56
=(57×55+27×54)/56
=(55×(57+27)-27)/56
= (55×84 - 27)/56
= 4593/56
=57×55/56+27×54/56
=(57×55+27×54)/56
=(55×(57+27)-27)/56
= (55×84 - 27)/56
= 4593/56