1.(x-y)^2(x+y)^22.(x-1/2)(x^2+1/4)(x+1/2)3.(-12s^4t^6)/(1/2s^2t^3)^24.[(-5+x)(-x-5)]^25.(-3/2ab^4)^2*16a^5b/(-2a^2b^3)^3

Question

1.(x-y)^2(x+y)^2
2.(x-1/2)(x^2+1/4)(x+1/2)
3.(-12s^4t^6)/(1/2s^2t^3)^2
4.[(-5+x)(-x-5)]^2
5.(-3/2ab^4)^2*16a^5b/(-2a^2b^3)^3

Answer 1

同学,以后不要这样了,今天只帮你一次!学习主要是靠自己,靠别人是没用的.
1.(x-y)^2(x+y)^2
原式=[(x-y)(x+y)]^2
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
2.(x-1/2)(x^2+1/4)(x+1/2)
原式=[(x-1/2)(x+1/2)](x^2+1/4)
=(x^2-1/4)(x^2+1/4)
=x^4-1/16
3.(-12s^4t^6)/(1/2s^2t^3)^2
原式=(-12s^4t^6)/(1/4s^4t^6)
=-12*4
=-48
4.[(-5+x)(-x-5)]^2
原式=[-(-5+x)(x+5)]^2
=[(x-5)(x+5)]^2
=(x^2-25)^2
=x^4-50x^2+625
5.(-3/2ab^4)^2*16a^5b/(-2a^2b^3)^3
原式=9/4a^2b^8*16a^5b/(-8a^6b^9)
=36a^7b^9/(-8a^6b^9)
=36a/(-8)
=-9a/2