化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-1又3分之1
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![化简求值,2(y-4)(3y+2)+5(-3+7)(y-1),其中y=-1又3分之1](/uploads/image/z/3912238-46-8.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%2C2%28y-4%29%283y%2B2%29%2B5%28-3%2B7%29%28y-1%29%2C%E5%85%B6%E4%B8%ADy%3D-1%E5%8F%883%E5%88%86%E4%B9%8B1)
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