(-3a^2b)^3除以(-3a^2b)^2+14a(二分之一ab^2)^2除以(7ab^3)
=(-27a^6b^3)除以(9a^4b^2)^2+14a(四分之一a^2b^4)除以(7ab^3)
=-3a^2b+a^2b/2
=-2.5a^2b
当a=负二分之一,b=二分之一时
原式=-2.5a^2b
=-2.5*(1/4)*(1/2)
=-5/16
(-3a^2b)^3除以(-3a^2b)^2+14a(二分之一ab^2)^2除以(7ab^3)
=(-27a^6b^3)除以(9a^4b^2)^2+14a(四分之一a^2b^4)除以(7ab^3)
=-3a^2b+a^2b/2
=-2.5a^2b
当a=负二分之一,b=二分之一时
原式=-2.5a^2b
=-2.5*(1/4)*(1/2)
=-5/16