-0.2a的3x+2次方b的3次方与1/2ab的y次方是同类项 求代数式3xy平方-[2x平方y-2(xy-3/2xy平方）+xy]+3x平方y
问题描述：
-0.2a的3x+2次方b的3次方与1/2ab的y次方是同类项 求代数式3xy平方-[2x平方y-2(xy-3/2xy平方）+xy]+3x平方y
答
563
答
-0.2a的3x+2次方b的3次方与1/2ab的y次方是同类项
3x+2=1 y=3
x=-1/3 y=3
代数式3xy平方-[2x平方y-2(xy-3/2xy平方）+xy]+3x平方y
=3xy^2-[2x^2y-2xy+3xy^2+xy]+3x^2y
=3xy^2-2x^2y+xy-3xy^2+3x^2y
=x^2y+xy
=xy(x+1)
=-1/3*3(-1/3+1)
=-2/3
答
-0.2a的3x+2次方b的3次方与1/2ab的y次方是同类项3x+2=1 y=3x=-1/3 y=3代数式3xy平方-[2x平方y-2(xy-3/2xy平方）+xy]+3x平方y=3xy^2-[2x^2y-2xy+3xy^2+xy]+3x^2y=3xy^2-2x^2y+xy-3xy^2+3x^2y=x^2y+xy=xy(x+1)=-1/3*3(...
答
因为是同类项，所以3x+2=y，y=3，所以x=1/3
所以把数字带入代数式得4/3