英语翻译Name the property illustratedPerform the indicated opera

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英语翻译
Name the property illustrated
Perform the indicated operation
Given the polynomial 3 2 4x − 2x + 7x −1,what is its degree?
Perform the indicated operation and reduce to lowest termsSimplify and write with positive exponents only.All variables represent positive real number?
.Name the property of the real numbers or the definition illustrated by the following statement:

命名所阐述的属性
执行指定的运算
给定多项式 3 2 4x - 2X +7X-1,角度是多少?（这里degree是不是有错误?）
执行指定的运算,并减少到最少项,简化并只用正指数写出.所有变量都代表正实数吗?
.按下述所阐明的条件命名实数的属性或定义：

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