(a^2b^2/-2c)^3÷(ab^2/4c^2)^2×(1/a+b)^2
=[a^(2*3-2)*b^(2*3-2*2)*(4c^2)^2]/[(-2)^3*c^3*(a+b)^2]
=-2a^4b^2c/(a+b)^2