计算:(a+1)(a²-2a+3) 5y²-(y-2)(3y+1)-2(y+1)(y-5)
问题描述:
计算:(a+1)(a²-2a+3) 5y²-(y-2)(3y+1)-2(y+1)(y-5)
答
(a+1)(a²-2a+3) 5y²-(y-2)(3y+1)-2(y+1)(y-5)原式=(a³+a²-2a²-2a+3a+3)5y²-﹙3y²-6y+y-2﹚-﹙2y²+2y-10y-10﹚=(a³-a²+a+3)5y²-3y²...