若a+19=b+9=c+11,求(a-b)²-(b-c)²+(a-c)²的值

问题描述:

若a+19=b+9=c+11,求(a-b)²-(b-c)²+(a-c)²的值

a+19=b+9=c+11
则:
a-b=9-19=-10
b-c=11-9=2
a-c=11-19=-8
(a-b)²-(b-c)²+(a-c)²
=10²-2²+8²
=100-4+64
=162保证对吗a+19=b+9=c+11则:a-b=9-19=-10b-c=11-9=2a-c=11-19=-8(a-b)²-(b-c)²+(a-c)²=10²-2²+8²=100-4+64=160算错了把