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

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

化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-1又3分之1
化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-4/3
2(y-4)(3y+2)+5(-3+7)(y-1)
解,得：
==2(3y^2+2y-12y-8)+20(y-1)
==6y^2+4y-24y-16-20y-20
==6y^2-40y-36
把y带入6y^2-40y-36得：
6*(16/9)-40*(-4/3)-36
==(32/3)+(160/3)-36
==(192/3)-36
==64-36
==28