[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)÷2y其中x=2019,y=20
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[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)÷2y其中x=2019,y=20
[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)÷2y其中x=2019,y=20
[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)÷2y其中x=2019,y=20
[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)]÷2y
=(4x²+12xy+9y²-4x²+y²-10xy-10y²-10y)÷2y
=(2xy-10y)÷2y
=x-5
当x=2019时
原式=2019-5=2014