Question

[(x+y)²-y(2x+y)-8xy]÷2x,其中x=2,y=1/2

快点，很急，谢啦

Answer 1

化简：
[(x+y)²-y(2x+y)-8xy]÷2x
=[x²+y²+2xy-2xy-y²-8xy]÷2x
=[x²-8xy]÷2x
=x/2-4y
带值：
=1+2
=3
满意请及时采纳，o(∩_∩)o谢谢

Answer 2

[(x+y)²-y(2x+y)-8xy]÷2x
=(x²+2xy+y²-2xy-y²-8xy)÷2x
=(x²-8xy)÷2x
=(x-8y)÷2
=(2-8*(1/2))÷2
=-1