1平方厘米差不多有多大?

2025-03-16 06:33:19
推荐回答(1个)
回答1:

一平方厘米是一个以一厘米长为边长的正方形的面积大小。

平方:

指数是2的乘方。

平方是一种运算,比如,a的平方表示a×a,简写成,也可写成a×a(a的一次方×a的一次方=a的2次方),例如4×4=16,8×8=64,平方符号为^2。
即2的平方为4 等于2×2=4,3的平方是9.

边长的平方(即边长×边长)=正方形的面积。平方又叫二次方,平方的逆运算就是开平方,也叫做求平方根,平方根写作:±√,例如±=±1.7320……,而正好±1.7320……的平方是3。而称之为算数平方根,例如=1.732...

代数中,一个数的平方是此数与它的本身相乘所得的乘积,一个元素的平方是此元素与它的本身相乘所得的乘积,记作x2。平方也可视为求指数为2的幂的值。若x是正实数,这个乘积相当于一个边长为x的正方形的面积;如果x为虚数,则这个乘积为负数。如果x为非虚数的复数,则这个乘积也是复数。

如果实数y = x2,就说y是x的平方;如果同时x是非负数,那么x就是y的平方根。如果一个整数  是某个整数的平方,则称
 为一个完全平方数或平方数。有理数的平方一定是有理数,无理数的平方可以是有理数,也可以是无理数。

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