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/2668120-16-0.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
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
2(y-4)(3y+2)+5(-3+7)(y-1)
=2(3y²+2y-12y-8)+5*4(y-1)
=6y²+4y-24y-16+20y-20
=6y²-36
当y=-1又3分之1时原式=6*19/9-36=38/3-36=-70/3
希望采纳
感觉不太对,是5(-3+7)(y-1),吗,若不是,追问吧!