解方程(y-3)^3-(y+3)^3=9y(1-2y)
问题描述:
解方程(y-3)^3-(y+3)^3=9y(1-2y)
答
(y-3)^3-(y+3)^3=9y(1-2y);(y-3-y-3)((y-3)²+(y-3)(y+3)+(y+3)²)=9y(1-2y);-6(y²+9-6y+y²-9+y²+9+6y)=9y(1-2y);-18(y²+3)=9y(1-2y);y=-6;确定么?确定啊,你可以带入验算的谢了~ 就选你了~~~~