(5的二次方+2a-1)-4(3-8a+2的二次方)
问题描述:
(5的二次方+2a-1)-4(3-8a+2的二次方)
答
(5的二次方+2a-1)-4(3-8a+2的二次方)
=(5^2+2a-1)-4(3-8a+2^2)
=25+2a-1-12+32a-16
=34a-4