y[y-3(x-y)]+y[3y-(y-3x)]=?

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y[y-3(x-y)]+y[3y-(y-3x)]=?y[y-3(x-y)]+y[3y-(y-3x)]=?y[y-3(x-y)]+y[3y-(y-3x)]=?原式=y(y-3x+3y)+y(3y-y+3

y[y-3(x-y)]+y[3y-(y-3x)]=?
y[y-3(x-y)]+y[3y-(y-3x)]=?

y[y-3(x-y)]+y[3y-(y-3x)]=?
原式
=y(y-3x+3y)+y(3y-y+3x)
=y(4y-3x)+y(2y+3x)
=4y²-3xy+2y²+3xy
=6y²

原式=y(y-3(x-y)+3y-(y-3x))
=y(y-3x+3y+3y-y+3x)
=y(6y)
=6y^2