什么是正方体的表面积

六个面的面积之和~长乘以宽乘以6~

长方体或正方体的6个面积之和表面积

就是一个正方体，外面的皮，就是一共有六面，即6个正方形面积的和。就是正方体边长的平方乘以六。

各个面的面积和

就是一个正方体，外面的皮，就是一共有六面，即6个正方形面积的和。就是正方体边长的平方乘以六。 Bob Dylan 的 《Blowing In The Wind》

How many roads must a man walk down
Before you call him a man?
Yes, 'n' how many seas must a white dove sail
Before she sleeps in the sand?
Yes, 'n' how many times must the cannon balls fly
Before they're forever banned?
The answer, my friend, is blowin' in the wind,
The answer is blowin' in the wind.

How many times must a man look up
Before he can see the sky?
Yes, 'n' how many ears must one man have
Before he can hear people cry?
Yes, 'n' how many deaths will it take till he knows
That too many people have died?
The answer, my friend, is blowin' in the wind,
The answer is blowin' in the wind.

How many years can a mounta