（-1/2xyz）×2/3x²y²×（-3/5yz³）这道计算题谁会写

3（-a+1)(-a-1)-2(a+1)^2
=3a²-3-2a²-4a-2
=a²-4a-5
（3x-2y）^2
=9x²-12xy+4y²
(3x-2y)^2(3x+2y)^2(9x^2+4^2)^2
=[(3x-2y)(3x+2y)(9x^2+4^2)]²
=[(9x²-4y²)(9x²+4y²)]²
=(81x^4-16y^4)²
=6561x^8-2592x^4y^4+256y^8
（x-2y）^2n/(2y-x)^2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
=(2y-x)^2n/(2y-x)^2n-1+y²-4x²-x²+2xy-y²
=2y-x-5x²+2xy
3.7654^2+0.4692*3.7654+0.2346^2
=3.7654²+2×0.2346*3.7654+0.2346²
=(3.7654+0.2346)²
=4²
=16