若a(a-1)-(a*a-b)等于负二,求2a*a-5ab+3b*b+2a的值.
问题描述:
若a(a-1)-(a*a-b)等于负二,求2a*a-5ab+3b*b+2a的值.
谢啦,
答
a(a-1)-(a*a-b)=-2,则b=a-2
2a*a-5ab+3b*b+2a
=(a-b)(2a-3b)+2a
=2(6-a)+2a
=12