试说明代数式(2y+3)(3y+2)-6y(y+3)+5y+16的值与y的值无关.
问题描述:
试说明代数式(2y+3)(3y+2)-6y(y+3)+5y+16的值与y的值无关.
答
∵(2y+3)(3y+2)-6y(y+3)+5y+16
=6y2+4y+9y+6-6y2-18y+5y+16
=22
∴(2y+3)(3y+2)-6y(y+3)+5y+16的值与y的值无关.