1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]其中x=-1,y=-22、3m(x-y)-n(y-x)3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]以上题目求解答、希望有心人帮忙,并写出过程、在此谢过!
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 17:47:27
![1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]其中x=-1,y=-22、3m(x-y)-n(y-x)3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]以上题目求解答、希望有心人帮忙,并写出过程、在此谢过!](/uploads/image/z/1962721-1-1.jpg?t=1%E3%80%81%5B2x%5E2-%28x%2By%29%28x-y%29%5D%5B%28-x-y%29%28-x%2By%29%2B2y%5E2%5D%E5%85%B6%E4%B8%ADx%3D-1%2Cy%3D-22%E3%80%813m%28x-y%29-n%28y-x%293%E3%80%81%283a%5E3%29%5E3-7a%5E5%5Ba%5E4-a%284a%5E3-1%29%5D%E4%BB%A5%E4%B8%8A%E9%A2%98%E7%9B%AE%E6%B1%82%E8%A7%A3%E7%AD%94%E3%80%81%E5%B8%8C%E6%9C%9B%E6%9C%89%E5%BF%83%E4%BA%BA%E5%B8%AE%E5%BF%99%2C%E5%B9%B6%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%E3%80%81%E5%9C%A8%E6%AD%A4%E8%B0%A2%E8%BF%87%21)
1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]其中x=-1,y=-22、3m(x-y)-n(y-x)3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]以上题目求解答、希望有心人帮忙,并写出过程、在此谢过!
1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]其中x=-1,y=-2
2、3m(x-y)-n(y-x)
3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]
以上题目求解答、希望有心人帮忙,并写出过程、在此谢过!
1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]其中x=-1,y=-22、3m(x-y)-n(y-x)3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]以上题目求解答、希望有心人帮忙,并写出过程、在此谢过!
1,原式=[2x^2-(x^2-y^2)][(x^2-y^2)+2y^2]
=(x^2+y^2)(x^2-y^2)
=x^4-y^4
=1-16
=-15
2,原式=3m(x-y)+n(x-y)
=(3m+n)(x-y)
3,原式=27a^9-7a^9+7a^6(4a^3-1)
=20a^9+28a^9-7a^6
=48a^9-7a^6
做错一道。。
1.原式=2(x²+ y²)
当x=-1,y=-2时,原式=10
2.3m(x-y)-n(y-x)=3m(x-y) +n(x - y)=(x- y)(3m+n)
3.
1、[2x^2-(x+y)(x-y)][(-x-y)(-x+y)+2y^2]
=(2x^2-x^2+y^2)(x^2-y^2+2y^2)
=(x^2+y^2)^2
=(1+4)^2
=25
2、3m(x-y)-n(y-x)
=3m(x-y)+n(x-y)
=(3m+n)(x-y)
3、(3a^3)^3-7a^5[a^4-a(4a^3-1)]
=27a^9-7a^9+7a^6(4a^3-1)
=20a^9+28a^9-7a^6
=48a^9-7a^6
=a^6(48a^3-7)