这题这么算对吗
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还芹和陵棚郑可以更嫌戚简化,
[(x-y)²+(x+y)(x-y)]÷2x
=(x²-2xy+y²+x²-y²)÷2x
=(2x²-2xy)÷2x
=2x(x-y)÷2x
=x-y,
x-y=3-(-1.5)=4.5
[(x-y)²+(x+y)(x-y)]÷2x
=(x²-2xy+y²+x²-y²)÷2x
=(2x²-2xy)÷2x
=2x(x-y)÷2x
=x-y,
x-y=3-(-1.5)=4.5
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=2x(x-y)/2x
=x-y
=x-y
追答
=3-(-1.5)=4.5
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x=3, y=-1.5
[ (x-y)^2 +(x+y)(x-y) ]÷2x
=( x^2-2xy+y^2 +x^2-y^2)÷2x
=( 2x^2-2xy)÷2x
=x-y
=3+1.5
=4.5
[ (x-y)^2 +(x+y)(x-y) ]÷2x
=( x^2-2xy+y^2 +x^2-y^2)÷2x
=( 2x^2-2xy)÷2x
=x-y
=3+1.5
=4.5
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