同学们在学习数学时一定不要忽视对概念的学习.一、算术平方根一般地,如果一个正数x的平方等于a,即x~2=a,那么这个正数x叫作a的____.a的算术平方根记为____,读作____,a叫作被开方数.温馨提示:0的算术平方根是0,正数有一个正的算术平方根,负数没有算术平方根.算术平方根a~(1/2)具有双重非负性:(1)被开方数a是非负数,(2)a~(1/2)本身是非负数.二、平方根 Students learn mathematics must not ignore the concept of learning First, the arithmetic square root Generally, if the square of a positive number x is equal to a, that is, x ~ 2 = a, then the positive number x is called a ____. The arithmetic square root of a is written as ____, read as ____, and a is called the square root. Tips: The arithmetic square root of 0 is 0, the positive number has a positive arithmetic square root, and the negative number has no arithmetic square root. The arithmetic square root a ~ (1/2) has a double non-negative: (1) the square a is non-negative, (2) a ~ (1/2) itself is non-negative.