已知x-2y=4,求5(x-2y)²-x+2y-60的值
问题描述:
已知x-2y=4,求5(x-2y)²-x+2y-60的值
答
答案是24 24不是x的值
答
=5x4^2-4-60=16
答
5(x-2y)²-x+2y-60
=5*4²-4-60
=5*16-64
=16
答
5(x-2y)²-x+2y-60
=5(x-2y)²-(x-2y)-60
=5*4²-4-60
=16