初二数学5y平方-(y-2)(3y+1)-2(y+1)(y-5)
问题描述:
初二数学5y平方-(y-2)(3y+1)-2(y+1)(y-5)
答
=13y+12
答
5y2-3y2+5y+2-2y2+8y+10
10y+12
答
5y²-(y-2)(3y+1)-2(y+1)(y-5)
=5y²-3y²+6y-y+2-2y²+10y-2y+10
=6y-y+2+10y-2y+10
=13y+12