因式分解:1:(ac+bd)^2+(ad-bc)^2 2:(a-2b)a^3-(b-2a)b^3
因式分解:1:(ac+bd)^2+(ad-bc)^22:(a-2b)a^3-(b-2a)b^33:a^2-b^2+2(ax-by)+x^2-y^2...
因式分解:1:(ac+bd)^2+(ad-bc)^2
2:(a-2b)a^3-(b-2a)b^3
3:a^2-b^2+2(ax-by)+x^2-y^2 展开
2:(a-2b)a^3-(b-2a)b^3
3:a^2-b^2+2(ax-by)+x^2-y^2 展开
1个回答
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①(ac+bd)^2+(ad-bc)^2
=(a²c²+2acbd+b²d²)+(a²d²-2adbc+b²c²)
=a²(c²+d²)+b²(d²+c²)
=(a²+b²)(c²+d²)
②(a-2b)a^3-(b-2a)b^3
=a^4-b^4-2a³b+2ab³
=(a²-b²)(a²+b²)-2ab(a²-b²)
=(a²-b²)(a-b)²
=(a+b)•(a-b)³
③a^2-b^2+2(ax-by)+x^2-y^2
=a²+2ax+x²-(b²+2by+y²)
=(a+x)²-(b+y)²
=(x+y+a+b)(x-y+a-b)
=(a²c²+2acbd+b²d²)+(a²d²-2adbc+b²c²)
=a²(c²+d²)+b²(d²+c²)
=(a²+b²)(c²+d²)
②(a-2b)a^3-(b-2a)b^3
=a^4-b^4-2a³b+2ab³
=(a²-b²)(a²+b²)-2ab(a²-b²)
=(a²-b²)(a-b)²
=(a+b)•(a-b)³
③a^2-b^2+2(ax-by)+x^2-y^2
=a²+2ax+x²-(b²+2by+y²)
=(a+x)²-(b+y)²
=(x+y+a+b)(x-y+a-b)
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