This plus that is twenty-one,this minus that is five.What is

来源：学生作业帮编辑：神马作文网作业帮分类：综合作业时间：2024/11/12 07:22:46

This plus that is twenty-one,this minus that is five.What is this and what is that?

设:this=x that =y
列方程:x+y=21
x-y=5
解方程得:x=13 y=8
即:this=13 that=8
因此答案为:This is thirteen and that is eight .
楼主,烦请你把此问的分类设置为:教育/科学下的"英语考试".
再问：请拿出综合算式
再答： x+y=21 x=21-y x-y=5 x=5+y 21-y=5+y 2y=16 y=8 x=5+8=13

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