C的平方等于20，那C等于多少
C\u7684\u5e73\u65b9\u7b49\u4e8e20\uff0c\u90a3C\u7b49\u4e8e\u591a\u5c11\uff1fC\u7684\u5e73\u65b9=20=4\u00d75\uff1b
\u5f00\u65b9\uff0cC=2\u00d72.236=4.472.
b=20
c=15,
b²-2c
=20\u00d720-2\u00d715
=400-30
=370
c=±√20
c=±2√5
所以c等于±2√5.
C^2=20
C=±根号20=±2倍的根号5
CC=20
C=4.47或-4.47
±2倍根号5
绛旓細c²=20 c=卤鈭20 c=卤2鈭5 鎵浠绛変簬卤2鈭5.
绛旓細C鐨勫钩鏂=20=4脳5锛涘紑鏂癸紝C=2脳2.236=4.472.
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