化简:(X2+XY+Y2)2 — 4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.
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化简:(X2+XY+Y2)2—4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.化简:(X2+XY+Y2)2—4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.化简
化简:(X2+XY+Y2)2 — 4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.
化简:(X2+XY+Y2)2 — 4XY(X2+Y2)
请注意:写在字母和括号后面的数字,是它的几次方.
化简:(X2+XY+Y2)2 — 4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.
原式=[(x²+y²)+xy]²-4xy(x²+y²)
=(x²+y²)²+2xy(x²+y²)+x²y²-4xy(x²+y²)
=(x²+y²)²-2xy(x²+y²)+x²y²
=[(x²+y²)-xy]²
=(x²-xy+y²)²
=(x^2+y^2+xy)^2-4(x^2+y^2)xy
=(x^2+y^2-xy)^2
原式=[(x^2+y^2)+xy]^2-4xy(x^2+y^2)
=[(x^2+y^2)^2+2xy(x^2+y^2)+(xy)^2-4xy(x^2+y^2)
=(x^2+y^2)^2-2xy(x^2+y^2)+(xy)^2
=[(x^2+y^2)-xy]^2
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化简:(X2+XY+Y2)2 — 4XY(X2+Y2)请注意:写在字母和括号后面的数字,是它的几次方.
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