化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-1又3分之1

问题描述:

化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-1又3分之1

2(y-4)(3y+2)+5(-3y+7)(y-1)
=2(3y²-10y-8)+5(-3y²+10y-7)
=6y²-20y-16-15y²+50y-35
=-9y²+30y-51
=-16-40-51
=-107你确定!!!!确定