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> 已知与互为相反数,求(x-y)2的平方根。-八年级数学
已知与互为相反数,求(x-y)2的平方根。-八年级数学
题目简介
已知与互为相反数,求(x-y)2的平方根。-八年级数学
题目详情
已知
与
互为相反数,求(x-y)
2
的平方根。
题型:计算题
难度:中档
来源:不详
答案
、∵
与
互为相反数
∴
+
=0
∴x-y+3=0且x+y-1=0
∴x="-1," y=2
∴(x-y)2=(-1-2)2=9
∴(x-y)2的平方根等于±3.
略
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4的平方根是(▲)A.2B.-2C.±2D.4-八年
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若的小数部分为b,则=.-九年级数
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题目简介
已知与互为相反数,求(x-y)2的平方根。-八年级数学
题目详情
答案
、∵
∴
∴x-y+3=0且x+y-1=0
∴x="-1," y=2
∴(x-y)2的平方根等于±3.