已知A=2x²+3xy-y²,B=-1/2xy,C=1/8x³y³-1/4x²y^4.求:2AB²-C
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解:
2AB²-C
=2(2x²+3xy-y²)(-1/2xy)²-(1/8x³y³-1/4x²y^4)
=2(2x²+3xy-y²)(x²y²)/4-(1/8x³y³-1/4x²y^4)
=x^4y^2+3/2*x^3y^3-1/2*x^2y^4-(1/8x³y³-1/4x²y^4)
=x^4y^2+11/8*x^3y^3-1/4*x^2y^4
如仍有疑惑,欢迎追问。 祝:学习进步!
2AB²-C
=2(2x²+3xy-y²)(-1/2xy)²-(1/8x³y³-1/4x²y^4)
=2(2x²+3xy-y²)(x²y²)/4-(1/8x³y³-1/4x²y^4)
=x^4y^2+3/2*x^3y^3-1/2*x^2y^4-(1/8x³y³-1/4x²y^4)
=x^4y^2+11/8*x^3y^3-1/4*x^2y^4
如仍有疑惑,欢迎追问。 祝:学习进步!
追问
这个我在网上也找到了,可,是最简吗?
追答
还可以提取一个x^2y^2/8出来
最后是x^2y^2(8x^2+11xy-2y^2)/8
至于里面的,系数是8,11,-2 已经无法分解了。
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