(1+0.56+0.67)*(0.56+0.67+78)-(1+0.56+0.67+78)*(0.56+0.67)谢谢了,

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/21 04:51:18

(1+0.56+0.67)*(0.56+0.67+78)-(1+0.56+0.67+78)*(0.56+0.67)谢谢了,

=(1+0.56+0.67)(0.56+0.67+78-0.56-0.67)-78*0.56*0.67=(1+0.56+0.67-0.56-0.67)*78=78