若a平方-3a=5=0,则2002-2a=6a的值是
问题描述:
若a平方-3a=5=0,则2002-2a=6a的值是
答
a²-3a+5=0
a²-3a=-5
2002-2a²+6a
=2002-2(a²-3a)
=2002+2x5
=2012